[lkml]   [2003]   [Jan]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: long stalls
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


-[ Brian Tinsley ]-
-[ Chief Systems Engineer ]-
-[ Emageon ]-

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:32    [W:0.053 / U:0.636 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site