Messages in this thread | | | Date | Tue, 07 Jan 2003 23:07:33 -0500 | From | Russell Leighton <> | Subject | Re: long stalls |
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I am pretty sure we are at 2.4.19.
Brian Tinsley wrote:
> Out of curiosity, which RH kernel are you using? I moved on to 2.4.19 > and 2.4.20 primarily because the RH 2.4.18 series of kernels > apparently has a scheduler bug (at least one) that causes the > heartbeat software from Linux-HA to loose heartbeat signals and > failover. Not a good scenario when you are trying to provide HA > systems to hospitals! > > > Russell Leighton wrote: > >> >> I can't help, but I can echo a "me too". >> >> We only see it when I have 2 file I/O intensive processes...they both >> will just stop for some few seconds, system seems idle...then >> they just start again. RH7.3 SMP, Dual PIII, 4GB RAM, 3com RAID >> Controller . >> >> Brian Tinsley wrote: >> >>> We have been having terrible problems with long stalls, meaning from >>> a couple of minutes to an hour, happening when filesystem I/O load >>> gets high. The system time as reported by vmstat or sar will >>> increase up to 99% and as it spreads to each procesor, the system >>> becomes completely unresponsive (except that it responds to pings >>> just fine - interesting!). When the system finally returns to the >>> world of the living, the only evidence that something bad has >>> happened is the runtime for kswapd is abnormally high. I have seen >>> this happen with the stock 2.4.17, 2.4.19, and 2.4.20 kernels on SMP >>> PIII and PIV machines (either 4GB or 8GB RAM, all SCSI disks, dual >>> GigE NICs). I've searched the lkml archives and google and have >>> found several similar postings, but there is never an explanation or >>> resolution. Any help would be *very* much appreciated! If any info >>> from the system in question is desired, I will be glad to provide it. >>> >>> >>> >> >
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