Messages in this thread | | | Date | Tue, 07 Jan 2003 20:48:28 -0600 | From | Brian Tinsley <> | Subject | Re: long stalls |
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Thanks for the reply!
I thought highmem I/O was addressed in 2.4.20? Am I off-base here?
I actually just built a 2.4.20 kernel with highmem debugging turned on. We'll see if anything pops up.
Brian Gerst wrote:
> 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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-[========================]- -[ Brian Tinsley ]- -[ Chief Systems Engineer ]- -[ Emageon ]- -[========================]-
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