Messages in this thread |  | | | Subject | Re: 2.6.0 "Losing too many ticks!" | | From | Albert Cahalan <> | | Date | 25 Dec 2003 13:05:34 -0500 |
| |
On Thu, 2003-12-25 at 13:14, Giacomo Di Ciocco wrote: > Joe Korty wrote: > > > Or maybe IDE DMA is disabled. That would account for lost > > ticks during period of heavy disk IO. Giacomo, type > > > > hdparm /dev/hda > > > > If it shows 'using DMA' off, try > > > > hdparm -d1 /dev/hda > > > > If that fails then the IDE driver you need is not > > configured in your kernel. > > > > Joe > > Hi Joe, > enabling the dma mode has resolved the "Losing too many ticks" thing, now the > system seems running fine,
OK. So DMA must be on when HZ is 1000. Let's have the kernel refuse to load the IDE driver w/o DMA if HZ is over 100. Ha, ha, only serious... :-(
> the unique strange thing is the "Unknown HZ value! > (92) Assume 100." message, that appears before the output of any program launched.
Your clock is screwed. Reboot, or upgrade procps to a version that can compensate. Version 3.1.15 from http://procps.sf.net/ is best.
Here's the release notes:
------------------------------------------------ [ANNOUNCE] procps 3.1.15 This release supports the NSA's high-security SELinux on the 2.6.0 kernel, without any additional libraries required. Thread support no longer sets off chkrootkit on buggy 2.4.xx kernels. (the PID 0 problem) Now "top" works on terminals with auto-margin problems.
For those of you still upgrading from procps 2.0.xx releases, you can expect:
* ps fully supports thread display (H, -L, m, -m, and -T) * ps can display NSA SELinux security contexts * top can show CPU usage for IO-wait, IRQ, and softirq * can set $PS_FORMAT to choose your own default ps format * better width control ("ps -o pid,wchan:42,args") * width of ps PID column adjusts to your system * vmstat lets you choose units you like: 1000, 1024, 1000000... * top can sort by any column (old sort keys available too) * top can select a single user to display * top can be put in multi-window mode and/or color mode * vmstat has the -s option, as found on UNIX and BSD systems * vmstat has the -f option, as found on UNIX and BSD systems * watch doesn't eat the first blank line by mistake * vmstat uses a fast O(1) algorithm on 2.5.xx kernels * pmap command is SunOS-compatible * vmstat shows IO-wait time * pgrep and pkill can find the oldest matching process * sysctl handles the Linux 2.5.xx VLAN interfaces * ps has a new "-F" format (very nice, like DYNIX/ptx has) * ps with proper BSD process selection * better handling of very long uptimes There's a procps-feedback@lists.sf.net mailing list you can use for feature requests, bug reports, and so on. Use it! Feedback makes things happen.
http://procps.sf.net/ http://procps.sf.net/procps-3.1.15.tar.gz
------------- recent changes ------------- procps-3.1.14 --> procps-3.1.15
hide kernel PID bug (Linux 2.4.13-pre1 to 2.4.MAX) #217278 #219730 #217525 #224470 ps: faster threaded display top: auto-margin problem #217559 ps: support NSA SELinux, all builds, Linux 2.6+ #193648 sysctl: tweak man page for ESR's broken parser
procps-3.1.13 --> procps-3.1.14
top: displays on more genuine serial terminals handle 32-bit dev_t of Linux 2.6 ps: finally, m and -m satisfy the original design ps: distinct per-thread and whole-process pending signals
procps-3.1.12 --> procps-3.1.13
ps: can display NPTL threads w/ kernel patch no seLinux for now (new kernel interface)
procps-3.1.11 --> procps-3.1.12
ps: explicit width ("ps -o pid,wchan:42,args") ps: $PS_FORMAT works properly #201575 top: new Linux 2.6.0-test4 CPU stats shown top: multiple -p options work again top: fixed 4 GB wrap-around ps: has a set of tests to ensure correctness man page: /var/run/utmp, not /etc/utmp #206583 required flags moved out of CFLAGS #205429 RPM generation handles /lib64 WCHAN skips leading '.' vmstat: numerous new features
procps-3.1.10 --> procps-3.1.11
compile with gcc 2.95 again (C99 issue)
procps-3.1.9 --> procps-3.1.10
handle GPLONLY_ symbols #143549 #188374 kill: better man page skill: better man page ps: PID-like columns change width as needed top: COMMAND instead of Command vmstat: -m displays slabinfo vmstat: -d displays disk stats
------------------------------------------------------------
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |