Networking :: Enabling GSO On A Ethernet I/f Reduces Performance?

May 29, 2011

I am enabling GSO via setting dev->features |= NETIF_F_GSO;I am observing that after I enable GSO my FTP get performance reduces.setup:ftp client running on a PC (IPv4 mode)connected across Ethernet interface.Any thought on the possible issues. Note: IPv6 is enabled. System running ftp server is in running 2.6.28 Linux.

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Software :: Mplayer Cache Option Reduces Performance

Mar 11, 2010

I needed a larger cache because I have some videos stored on another samba server and it's laggy. I set options: cache=20000, cache-min=10 , and that helped to play those videos smoothly, but that caused all 1280x720 mp4 files stored on my local drive to lag and A/V desync with mplayer message: **** Your system is too SLOW to play this! ****

I tried cache values from 1000 to 80000, and they lag in any case. But without the option "cache" these videos play well. Now I commented "cache" in config.



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Ubuntu Networking :: User Interface Changed And It Defaulted To Ethernet And Now It Won't Letting To Go Back On Wireless - Disable Ethernet?

Sep 1, 2011

My laptop was working fine on wireless till the userinterface changed and it defaulted to ethernet and now it won't let me go back on wireless How do i disable ethernet?

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Ubuntu :: Display Reduces To 1 Line?

Feb 6, 2011

I am using Ubuntu live on a i7 x64 with Zotac nvidia. Not sure if Ubuntu started the issue.

When I am using the PC, suddenly the whole display goes blank except for one horizontal line. Even when I restart, the same line will be only visible.

Then I have to wait for sometime with the PC shutdown. After which the whole display will be back. Not sure what is causing the issue.

I suspect its an issue with the graphics card. But just want to know if ubuntu is contributing to the issue in any way.

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Hardware :: Ps Change Reduces CPU Temperature?

Sep 25, 2010

Over the course of this year, I've been upgrading my system. Started with a mobo/CPU/RAM/video swap, going to a quad core Phenom-II 955 with 4 Gigs of RAM and an Nvidia GT-240 video card. I then dialed up the clock on that CPU, taking it to 3.415 GHz from its nominal 3.2 GHz, and I overclocked the RAM to 1704 MHz from the system default of 1333 MHz. Then I stuffed another hard drive into the box (the sixth HD in the box). Then I shove another 4 Gigs of RAM into the system, for a total of 8 Gigs.

Over this entire exercise, I have not changed the power supply. It was a Coolermaster 500 Watt supply that has served me well and faithfully. I did a careful power budget of this system and concluded that it was sucking somewhere between 420 and 450 watts at full load. Hence, my PS was very marginal. Allowing for derating as the PS aged, I figured I was really close to the edge.

However, I was having no symptoms, so I went with it. My system sits in a room where the temperature is usually around 28 C, and it would idle with a CPU temperature of 40C. Well, I started having some symptoms that were consistent with inadequate power within the last few days. I wasn't terribly surprised at that, so I didn't complain about having to go and buy a new PS. I purchased a Coolermaster GX 750 Watt supply. This is a high efficiency unit.

Since installing it a couple of hours ago, my system is idling with a CPU temperature of 36C. Mobo temp appears unchanged. No changes to BIOS, overclocking is unchanged, and nothing in the system is different except the PS. The case is an Antec P182, which puts the power supply in the bottom of the case inside its own duct. So, the motherboard and CPU don't see any heat from the PS; all of that is exhausted along its own path.

It is too soon yet for me to know if my symptoms that caused me to change the PS are gone, but the temperature change is quite striking. I have no explanation for it. Does anyone else? Temperature is being reported using the sensors command. Mandriva 2010.1 system. Edit: I am also noticing 1 to 3 degree C drops in hard drive temps, while ambient temperature in this room is constant. There are 6 drives in this box, and their temp history has been pretty constant...

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Fedora :: A Batch Program That Reduces Size Of Jpeg Files?

Nov 11, 2009

king for a program or command line tool that ease the process of reducing size of many .jpeg files at once.I've been doing this with gimp manually by reducing jpeg quality and it's painful for 10 or 15 files to do that

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Hardware :: Filesystem Reduces The Speed Of The Disc (not 4kb Sector Size)?

Jul 15, 2011

I bought new hdd (WD2002FAEX-007BA0). This disk have normal block size (512bytes) so I do not bother with the alignment.I trying make test write speed.

dd if=/dev/zero of=/dev/sda oflag=direct bs=16384 count=100000
100000+0 records in


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Ubuntu :: Ondemand Vs Performance - Increases The Clock Speed To Performance When The CPU Is Under Load

Jul 31, 2010

I just wanted to know if having my laptop set to ondemand, will this affect performance in any way? I realize it increases the clock speed to performance when the CPU is under load, but does the time it take to go from ondemand to performance affect speed? Will there be any noticeable difference between the two setups? I have a dual core intel at 2.2GHz when in performance. When ondemand is set with no load it downclocks to 800Mhz.

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Fedora Networking :: Enabling The Network In 11?

Jul 22, 2009

when I tried to configure network I came across a problem that the enable button on top of network manager GUI is disabled. So alternatively I enabled it with ifconfig command. I also configured DNS servers. But the problem is whenever I reboot my machine. I have to reactivate the network from terminal and give the DNS servers again, because DNS settings are not saved.

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Networking :: Enabling SNMP On Suse 10?

Jul 29, 2010

I need to enable SNMP on our Suse linux boxes, so that What's Up Gold can monitor them.

I need to add the community name, that I know, but where?

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Networking :: Enabling Wireless In Mint?

May 23, 2011

i cannot connect to the internet wirlessly,only via eternet cable which works fine,it tells me my wirless is not enabled

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Networking :: Ethtool Not Properly Enabling WOL?

Nov 25, 2008

I'm having problems enabling Wake-on-LAN using ethtool.I'm using ethtool 5.1 on Fedora 8. Ethtool reports that the card supports u,m,b,g for WOL modes. I can run "ethtool -s eth0 wol g", which completes without errors.If I run ethtool again, the Wake-on setting is changed to whatever I just set it to. However, when I actually shutdown the machine, the lights on the NIC don't stay on as they normally should, and any attempts to wake the machine have no effect. The machine dual-boot Windows XP, and I have enabled WOL in the driver there. When I shutdown the machine from XP, everything works just fine. The NIC lights remain on and the machine wakes up properly. So...I think I have my BIOS configured properly, and my WOL utility is working properly.

Hardware Info:
Adapter: Intel Pro/1000 GT PCI (Vendor ID: 8086, Device ID: 107C
Motherboard: Asus P5Q Pro

lspci Output:
Ethernet controller: Intel Corporation 82541PI Gigabit Ethernet Controller (rev 05)

ethtool Output:
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full


dmesg Output:
e1000: eth0: e1000_probe: Intel(R) PRO/1000 Network Connection
ADDRCONF(NETDEV_UP): eth0: link is not ready
e1000: eth0: e1000_watchdog: NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX


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Ubuntu Networking :: Locks Up When Enabling Wireless?

Apr 19, 2011

I've been having an issue for the last day or so. I have an HP Pavilion dv8000 running 10.10. Whenever I boot with the Wireless activated, it will lock about 3-4 seconds into the log-in screen (I'm guessing when it connects to my router). If I have the wireless deactivated (like now), I am able to use the ethernet connection, or (like now) use my phone to tether internet. But, as soon as I click the wireless to active, locks up. The wireless activity light flashes, but that's all.

I'm pretty good about updating whenever I use my laptop, but I think something in the most recent update may have broken my wireless connection.

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Networking :: Enabling WiFi On Netbook Running 10.4

Jun 2, 2010

I used to have no problems with the wifi on my Acer One netbook. After a friend played with the network configurations, the wifi is disabled.

ariel@segal:~$ sudo -i
[sudo] password for ariel:
root@segal:~# iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11bg ESSID:off/any
Mode: Managed Access Point: Not-Associated Tx-Power=0 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key: off
Power Management: off

root@segal:~# ifconfig wlan0
wlan0 Link encap:Ethernet HWaddr 00:23:4e:34:bf:bd
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

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Networking :: Enabling Wi-Fi Internet Connection On OpenSuse 11.2

Aug 15, 2010

I have a Wi-Fi connection in my home. There is a telephone through which a wire comes out, when I connect that wire with my laptop I can connect to the Internet.

Now I want to connect to the net without that wire.

linux-dpjj:/home/anisha # ping
ping: unknown host
Well, I followed this link:


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CentOS 5 Networking :: Stuck Enabling Ip Forwarding?

Mar 26, 2009

I'm running Centos 2.6.18-53.1.13.el5 in a VM. Currently I'm studying for my RHCT.I'm trying to enable IP forwarding so I edited this line in the /etc/sysctl.conf:

# Controls IP packet forwarding
net.ipv4.ip_forward = 1
Then I ran sysctl -p


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Fedora Networking :: Enabling Wifi On An Acer 1360

Dec 24, 2009

trying to bring back to useful ife an old laptop: an Acer 1360.

I have installed kmod-ndiswrapper to assist me. The laptop has one of these:


00:0a.0 Ethernet controller: Linksys, A Division of Cisco Systems [AirConn] INPROCOMM IPN 2220 Wireless LAN Adapter (rev 01)

I have grabbed the Windows drivers for this card and installed:


[graham@old-acer ~]$ ndiswrapper -l
WARNING: All config files need .conf: /etc/modprobe.d/ndiswrapper, it will be ignored in a future release.
neti2220 : driver installed
device (17FE:2220) present

lsmod shows:


ndiswrapper 158060 0

Looking good to me - (is that conf file required an issue?) but Network Manager doesn't recognise that I have any wlan running at all. The Wifi button on the laptop is on but 'red' and not 'green' for up and running.

Um. Next steps? I suppose I could buy a compatible wifi card and slap it in?

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Ubuntu Networking :: Flaky Wireless Since Enabling WPA2

Oct 26, 2010

I've got a BCM 4312 card on a Dell laptop running 10.04 and an Apple Airport network. Since I configured the Airport to use "WPA2 Personal" Authentication, my connection is flaky: it drops for no apparent reason and sometimes I can't connect at all. When authentication is turned off, the connection is rock solid.

Here's an example from the syslog of a failed attempt to connect:

Oct 26 19:31:24 firefly NetworkManager: <info> Activation (eth1) starting connection 'Auto Rittenhouse'
Oct 26 19:31:24 firefly NetworkManager: <info> (eth1): device state change: 3 -> 4 (reason 0)


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CentOS 5 Networking :: DNS Is SLOW After Enabling/disabling NetworkManager?

Mar 30, 2010

I ran into this today accidentally turned on networkmanager and it took it upon itself to rewrite some things and proceeded to make any DNS lookups on my server Especially those reverse DNS for SSH and SFTP take so long they would just time out instead of completing.. Disabling networkmanager did not undo the damage either. Short fix, Erase your resolv.conf file and add 2 lines to it as so, your nameservers!

nameserver yyy.yyy.yyy.yyy
save, and run the following commands
service network restart
service httpd restart
service sshd restart

Mine had a search line added by networkmanager and some others, when i reverted it back to as above, almost instantly after restarting the services the systems lookups were once again, lightning fast. DNS lookups were taking upwards of 20 seconds for unknown reasons after this happenned

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Fedora Networking :: Windows By Enabling A Service Called 'routing'?

Jan 8, 2010

I don't know what I'm trying to achieve falls into 'routing' or 'Bridging'???I have two network ports (with static IP ) and I would like to forward RX packets of one to the other.

I have done this in Windows by enabling a service called 'routing'.Is there something similar in Fedora 11? I am pretty sure there are a few thread explaining these but I am just not educated enough to find one that makes sense to me, so Please excuse me for starting a redundant thread and point me to it?

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Ubuntu Networking :: Enabling Auto-connect For Reliance Netconnect?

Oct 11, 2010

I have installed ubuntu 32 bit version on my HCL netbook. I use reliance netconnect (Huwai EC 1260 or 168c). I have configured it and it works well. But the only problem is that I have to connect the netconnect device before booting. If I connect it when its ON, the networkmanager does not connect automatically. even on the right on the tray icon, enable mobile broadband option is not there.

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Ubuntu Networking :: Enabling Wireless With RaLink In Zotac HD-ND22

Mar 10, 2011

I just want to setup adhoc network using the wireless card that came with the box but I'm having a hard time getting it up. I have gone through a lot of posts about wireless troubleshooting but nothing has solved it. Left clicking the network manager tray icon always says wireless network is disconnected. "Enable Wireless" is checked.

Some info:

rfkill list
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no


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Ubuntu Networking :: Enabling Wifi In Laptop For Other Devices When Connected To Wired Network

Jul 14, 2010

This may be more suited for the networking forums, but I figured Community Cafe would be well rounded enough for someone to tell me if this is even possible (with minimal configuration that is).There are a few places I travel where I only have a wired connection to the Internet (no wifi), but when this happens is there a simple way to create an adhoc network so wireless devices can route through my computer and to the network? Reason I'm asking is I'm thinking of getting an iPad or iPod Touch which have wireless connections, but in the cases where my laptop is using a wired ethernet connection and the wireless card isn't used, I'd like to create an adhoc wireless network that'll let such wireless devices work.

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Software :: Xsane Reduces Size Of Image Of Scanned Page - How To Get Back To Full Size?

Nov 12, 2010

Ubuntu 10.04, xsane 0.996, Brother MFC 240c scanner.I just finished writing a long dissertation on my problem with this scanning environment (which I will spare you). In a nutshell the resulting image, when printed, is smaller than the original document. In writing my dissertation for this post I determined that the cause of the issue is that xsane believes I am scanning an 8.5 x 14 inch document when I am in fact scanning an 8.5 x 11 letter. So the question is... can I change the size to 8.5 x 11? and if so, how? I have not found anything in the xsane Preferences.

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Networking :: Ubuntu VS Windows 4-to-1 Performance?

Mar 10, 2011

Ubuntu V 10.10, vs Windows 2k server. Comparable hardware. From a XP workstation on the same gigabit switch. Share uses Samba.

I start a copy of a 2GB file from the workstation to my Linux share, and then to my W2k server. The copy to the w2k machine finishes in less than 60 seconds, the copy to my Linux machine takes 4 minutes. I am a windows veteran, but a Linux newbie. Are there settings I should look at, or something faster than Samba?

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Fedora Networking :: Very Slow Firefox Performance

Dec 26, 2009

I have fedora 12 and since I started using firefox I noticed that it performs very slow. Slow when opening, when displaying information etc..I thought that there was something wrong with my wireless device but I installed opera and it works very fast. The strange thing is that before that I installed google chrome and also worked very slow for me.

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Ubuntu Networking :: Would Like To Optimize DSL Connection / Performance

Sep 3, 2010

My DSL is working and my computer is on line but I would like to optimize my connection for better speed. I found a utility for this at but it was written for Windows.

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Ubuntu Networking :: Samba Performance On Virtual Box

Aug 1, 2011

I have a WinXP virtual box and have setup a Samba server to have it use directly a couple of directories on the Linux side. The Samba performance is definitely better than the built-in shared folders of the virtualbox, but there is nothing to write home about either: transfer seem to top at around 3Mbyte/sec.

The machine is a laptop (Core i5 CPU (M520@2.40GHz) and a 7200RPM HDD) running Kubuntu 10.04.The Samba share uses a dedicated "host-only" network adapter. There is an iptable-based firewall to which i added the required 4 statements to let the Netbios traffic go through (without them nothing works...)So, given the hardware, are the 3MB/s a decent figure? And if not, what should I aceeive, and where can I look improve on the current numbers?

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Networking :: Monitoring Application Performance Over Networks?

Dec 10, 2010

I have been ask to provide a network monitoring utility that can create network benchmarks for applications to graphically see how it performs.

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Ubuntu Networking :: Services To Disable To Boost Performance?

Oct 15, 2010

I installed Ubuntu 10.10 today Netbook Edition on the Asus Eee PC 1015PED. Specifications for Asus Eee PC 1015PED: Atom 455, 1.66 GHz, 1Gb ram, 250Gb drive, Bluetooth 3.0, 0.3 megapixel webcam, Gigabit Ethernet, WSVGA (1024x600), sound card compatible with the HD audio connector, d-dub, three USB 2.0 ports, 6-cell - lithium Ion - 4400mAh, WiFi 802.11 b/g/n.

solve the problem or an indication of the package to install. tutorial under the title, which services to disable to boost performance. first place to help you connect to the Internet. especially to the netbook'a - Asus Eee PC 1015PED. I updated everything on connection via cable. Detects the connection, but when it connects after a while.. "Wireless - Network Disconnected".


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