Messages in this thread | | | Date | Tue, 07 Jan 2003 21:44:15 -0500 | From | Brian Gerst <> | Subject | Re: long stalls |
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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. > > > With 4GB of memory you are likely boucing I/O requests to low memory. This has been fixed in 2.5. I do not know if a backport exists for 2.4.
-- Brian Gerst
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