General :: How To Measure Interrupt Latency Using C In System
Apr 22, 2010Program code as how to measure interrupt latency..
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Software :: Program To Measure Disk Latency?
Feb 17, 2011I'm looking for a program that can measure disk latency. I would prefer one that could do it on a raw device. Also reporting average and max latency would be a plus.
Anyone know a program that can do this?
General :: Ifconfig Indicates Different Interrupt Number For Eth0 Than Proc Aqd Sys File System
Sep 22, 2011On my system (OpenSUSE 11.4 - kernel 2.6.37) ifconfig indicates different interrupt number for eth0 than proc aqd sys file system.
ifconfig indicates 17:
proc fs indicates 43:
sys fs indicates 43:
Relevant part of lspci -vv output for irq 17 (this belongs to wlan0 and not to eth0):
Relevant part of lspci -vv output for irq 43:
General :: How To Measure System Load On Ubuntu Media Center
Jun 6, 2011I want to measure the system load on my Ubuntu media center computer. What commands and utilities are available? I've explored the w, top, iostat, and uptime commands. Anything else I could use?
View 5 Replies View RelatedFedora Hardware :: System Crashes Due To Incorrect Interrupt Sharing
May 15, 2010I have random crashes since I upgraded from Fedora 11 to Fedora 12.I searched the internet to try to find the root cause of the problem.I created this bug report:URL...However, no comments were added how to solve the problem.Enabling msi for nvidia and hda-intel made the system much more stable. But I still experience sometimes crashes.I do not know how to enable msi for uhci_hcd:usX, which is still sharing interrupts with ata_piix and ehci_hcd:usbX.Have you some hints? I hate it when my Fedora Linux system is crashing randomly.
View 1 Replies View RelatedGeneral :: Short A Time Can Time (system Program) Measure?
Apr 15, 2010I'm just wondering what the limits for time are. I have a program that always takes exactly 20 ms, so I assume this is the lowest it can measure, but I want to see if there's some sort of documentation of this.
View 3 Replies View RelatedGeneral :: Find Out Latency To RAM Of Machine?
Sep 4, 2010How do I find out the memory bandwidth/latency to RAM of the machine?
View 3 Replies View RelatedGeneral :: Possible To Interrupt The Boot Sequence?
Apr 30, 2010Is there a way to interrupt the boot sequence, or execute it line by line? Alternatively, after a command has executed and the scree fills up, is there any way to "page up" on the screen?
View 1 Replies View RelatedGeneral :: Test Latency / Communcation Between Two Cores?
Feb 17, 2011I have a four-cores machine (core1,core2, core3, core4 ). I want to test the communication or latency between two cores (for example, core1 and core2; core3 and core4). Does anyone know how to write a code to test it under linux operating system?
View 1 Replies View RelatedGeneral :: Blocking Or Sleeping An Interrupt Handler?
Dec 2, 2010Assume: 1) Multi-cpu environment 2) Process that gets interrupted, is the same process that executes the interrupt handler, so I guess technically nothing gets interrupted except what the process was doing before, but it is still executing as it is executing the handler. 3) There is no top or bottom half, when an interrupt takes place the handler is invoked, executes, then return from interrupt, simple as that.
Why would sleeping the handler (puts in sleep queue, context switch to next runnable process) be a bad idea?
General :: RAID Disk Failure Interrupt Notification?
Apr 4, 2010I have installed a Fedora Core 12 Linux system onto a RAID 1 file system. I now need a way of getting an notification if the disk fails. Is there an SNMP MIB that covers Intel RAID? I have done the searching but still the answer alludes me.
View 1 Replies View RelatedGeneral :: Cannot Interrupt Boot Sequence To Re-install Different Distro
Jan 3, 2011I have a box with Novell Suse linux installed. It asks for username and password I do not have and cannot figure out. I also have a SantaFe distro CD with which I would like to replace the Suse on the box. I cannot get the box to BIOS to change the boot order to boot from CD. I would like to break free of Windows, but can't seem to get there from here...
View 5 Replies View RelatedGeneral :: Netem For Mac OS X To Emulate Network Latency And Dropped Packets?
Aug 9, 2010I'm looking for an open source/free network emulator tool that I could use on Mac OS X, to simulate a slow network connection, limited bandwidth and other network characteristics such as dropped packets etc for both UDP/TCP connections (or even on the physical layer).
I'm looking for the simplest solution that would allow me to run TCP/UDP servers and have a few clients connect to them on localhost emulating various network connections. I'm mainly wondering if I can use something like Linux's netem on Mac OS X (or even better cross-platform Windows/Linux/Mac). Perhaps I can run VirtualBox and a Linux kernel running netem, has anyone had luck with that?[URL]...
General :: Networking - Command Line Tools For Analyzing OS - NIC TCP Latency
Sep 14, 2011I'm hoping to find an existing Linux tool for measuring latency:
I'm trying to diagnose how much latency my OS and NIC card are adding to TCP latency in Linux. I looked at the following tools but all (at least at the surface level) measured bandwidth (Mbps/sec) rather than latency (nanoseconds for transmition of 1 packet of size x).
If I were to write a custom test, it would likely do the following:
Client:
Create a fake message of the specified length with some padding for an incrementing identifier. Open a TCP connection (with the right parameters like TCP_NODELAY, etc) Loop and send messages containing an incrementing identifier. Store the current system time (in nanos) associated with the identifier. Listen for responses, record the current time and record the latency of that identifier asynchronously Server Listen for a connection Echo back any message received
Assuming both boxes had the same setup (configs, cards, OS, CPU, etc), are relatively close to eachother in the network, and one knows roughly the network's latency contribution, one could get a rough estimate of the OS + NIC contribution and begin testing various configurations.
One could also get a more accurate picture of the latency by using a network sniffer and snooping on the lines between the two hosts, calculating the latency between the two sides for an ID, and then subtracting that from the internally measured latency.
General :: Calculating Handoff Latency In Mobile Ipv6 Environment
Nov 30, 2010i have installed ns 2.33 and added the patch mobiwan for supprting mobile ipv6. i ran some tcl scripts , and below is the trace file generated. calculate the handoff latency, and if someone has awk or perl script to do so, tcl file [URL] out.tr [URL]
View 1 Replies View RelatedGeneral :: How To Measure Synchronization Performance
Jul 9, 2010I'm looking for a tool for Debian Linux that can measure the synchronisation performance between two desktops.
I'm using RADClock instead of the NTP client to synchronise my desktops.
General :: Measure GUI App Startup With Time(1)
Mar 12, 2010I want to measure the startup time of any GUI app (e.g. firefox) using the time(1) command. However, timing is measured until the app is closed, which has to be done manually by exiting it or clicking X.
How can I get the app to load, terminate immediately and give me the startup time?
General :: Measure The Amount Of Usb Data ?
Jan 21, 2010I would like to measure the amount of traffic my webcam is sending. What is the best way to do this? I tried iostat command, but i do not see the webcam traffic back.
View 1 Replies View RelatedGeneral :: Measure The Bandwidth Used By A Given Process After It Has Completed?
Feb 9, 2010Is there a way to get a summary of how much bandwidth a given process used on Linux after the process completes? I do not want a monitor, I want something I can look at after the task has completed..
Ideally something like the "time" command or a profiler, but for network usage.
General :: Measure Script Execution Time?
Jan 4, 2011In bash shell, is there a simple way for me to monitor the time taken to run a script and output the time taken?
View 1 Replies View RelatedGeneral :: Measure How Fast Computer Boots Up
Jan 5, 2010I just wanted to glean some sort of a general average and compare my system with everyones. post your computers:boot time of course hardware specifications (processor, HDD, RAM, etc.) distribution if it's a laptop or desktop (or a netbook ) Mine is 43 seconds, running Ubuntu 9.10 on a netbook. My hardware specs: Intel Atom 1.6 GHz 320 GB 7200 rpm HDD 2 GB RAM
View 14 Replies View RelatedGeneral :: Measure File Transfer Speed?
Jun 15, 2010I have one Linux server equipped with WiFi . I want to measure data rate speed on this connection . Is there any utility on my Linux that can measure data speed on one specific Ethernet connection when transferring large size files through WiFi connection?
View 2 Replies View RelatedGeneral :: Measure Or Track The Progress Of A Command On A GNU Distro?
May 18, 2010If I run
cp file1 file2
I'd like to be able to track it's progress. Is there a command I can use for this?
rsync --progress
has this, but is there something generic, usable for "any" command?
Programming :: How To Achieve Interrupt
Jul 30, 2011How to achieve interrupts
any sources available apart from kernel code which show the usage of code...
Hardware :: CAS Latency For AMD Phenom II Overclocking
Jun 12, 2010I'm getting close to ordering the components for a new machine based on the AMD Deneb quad core and had one last question.I'd like to try a little careful overclocking, not only for the performance increase but also to learn how. Nothing extreme, no gaming, just whatever I can get with good stability with the stock heatsink and fan.I was going to get 8GB on 2x4GB strips but they are all CAS latency 9. The MB has 4 slots for a total of 16GB capacity. Would I be better off going with 4x2GB strips and try to get a lower latency strip like maybe 7?
View 5 Replies View RelatedGeneral :: Use "sar" Or Any Other Tools To Measure Cache Hit Ratios?
Jan 27, 2011According to the manual of "sar" in Unix systems (computerhope.com/unix/usar.htm), it allows to determine the number of accesses to system buffers (lread and lwrite). Thus, we can easily calculate the cache hit ratio of I/Os via the system buffer.
However, "sar" in Linux only measures I/Os to physical devices (as bread and bwrite), instead of those to the system buffer (linux.die.net/man/1/sar)
I need to measure cache hit ratios for I/Os on Linux system buffer, and was wondering if there's a way to use "sar" or any other similar tools to determine such ratios.
Hardware :: IRQ / Interrupt Conflict With MegaRAID
Feb 3, 2010Ever since Linux kernels beyond 2.6.24.3, I've been unable to boot my HP Netserver LH3. It gives a kernel panic with a variety of messages that always include
"common_interrupt+0x38/0x39"
I tried everything from updating the BIOS and firmware, to myriads of differing kernel configurations (at 4 hours per compile, imagine the agony).
I also tried booting with every combination of the kernel boot parameters acpi=off, noapic, nolapic, irqpoll, etc., that I could imagine. No dice. In final desperation, I began unplugging PCI cards one by one before finally disconnecting the SDLT drive from the Netraid SCSI. It seems that in later kernels or versions of udev, sharing the SCSI bus with the LH3 drives causes conflicts. I have an additional AHA SCSI card in the machine, so will try connecting the SDLT to that and see how it goes.
Hardware :: Serial Port Interrupt
Jan 25, 2011I need cause an interrupt on a serial port. If I put a single HIGH on the RX pin, will that cause one? I all ready use the 4 control lines for data.Hope I am making sense?
View 5 Replies View RelatedDebian :: Finding Advantages Of Low Latency Kernels?
Feb 26, 2011As I am trying to understand if there are any advantages using a kernel optimized to have low latency for the desktop, it would very helpful if anyone using one could give me his opinion. I read about the liquorix kernel and found a controversy and used google to find more information.
View 2 Replies View RelatedDebian :: Get Latency Down When Calling Aptitude And Dpkg?
Jun 20, 2011I tend to use commands like 'aptitude search $something' or 'dpkg -S /usr/bin/command' (some command/variable in both) or 'apt-file search $something' and all/or many of its brethen. I do run updatedb every now and then but that command is for the overall health of the system similar to tracker perhaps (but not running continously like tracker and the daemon).
What I'm looking for is, if there is a way to get the package list (installed and otherwise) updated aggressively so that whenever I use any combination of aptitude or dpkg I get better response from the system. From what little I understand, aptitude or dpkg or somewhere there would be some sort of index/database where the current state of package availability and system state would be recorded. If there is a way that this could be improved upon would be nice to know. If there is some experimental package or road which the debian folks are looking for in the future so this latency can come down.