* Re: Fwd: kswapd issues + kernel 2.4.21-32.0.1.ELsmp [not found] ` <fa.Fyq10Ks5ejO6P+77Y8svOle1kro@ifi.uio.no> @ 2007-04-01 20:27 ` Robert Hancock 0 siblings, 0 replies; 4+ messages in thread From: Robert Hancock @ 2007-04-01 20:27 UTC (permalink / raw) To: Pedram M; +Cc: linux-kernel Pedram M wrote: > Hi, > > I've seen this around, and have heard about it in forums and else-where, > could somebody enlighten me with more information or with experiences > they have had. Looks like kswapd begins to eat CPU dramatically till the > box eventually locks up. > > Thanks, > Pedram Looks like an old RHEL3 kernel - first off try the latest updated kernel which is 2.4.21-47.0.1.EL. -- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from hancockr@nospamshaw.ca Home Page: http://www.roberthancock.com/ ^ permalink raw reply [flat|nested] 4+ messages in thread
[parent not found: <9c9aa5d00703310110s2a21f19l37544c3d46be53c9@mail.gmail.com>]
* Fwd: kswapd issues + kernel 2.4.21-32.0.1.ELsmp [not found] <9c9aa5d00703310110s2a21f19l37544c3d46be53c9@mail.gmail.com> @ 2007-03-31 8:11 ` Pedram M 2007-03-31 15:50 ` Rik van Riel 2007-04-01 10:21 ` Dan Aloni 0 siblings, 2 replies; 4+ messages in thread From: Pedram M @ 2007-03-31 8:11 UTC (permalink / raw) To: linux-kernel Hi, I've seen this around, and have heard about it in forums and else-where, could somebody enlighten me with more information or with experiences they have had. Looks like kswapd begins to eat CPU dramatically till the box eventually locks up. Thanks, Pedram ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Fwd: kswapd issues + kernel 2.4.21-32.0.1.ELsmp 2007-03-31 8:11 ` Pedram M @ 2007-03-31 15:50 ` Rik van Riel 2007-04-01 10:21 ` Dan Aloni 1 sibling, 0 replies; 4+ messages in thread From: Rik van Riel @ 2007-03-31 15:50 UTC (permalink / raw) To: Pedram M; +Cc: linux-kernel Pedram M wrote: > Hi, > > I've seen this around, and have heard about it in forums and else-where, > could somebody enlighten me with more information or with experiences > they have had. Looks like kswapd begins to eat CPU dramatically till the > box eventually locks up. You'll want to contact your distro's support people, who are way better than I am at extracting all the information needed to debug your problem. OTOH, chances are it's been fixed already in a more recent kernel. -- Politics is the struggle between those who want to make their country the best in the world, and those who believe it already is. Each group calls the other unpatriotic. ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Fwd: kswapd issues + kernel 2.4.21-32.0.1.ELsmp 2007-03-31 8:11 ` Pedram M 2007-03-31 15:50 ` Rik van Riel @ 2007-04-01 10:21 ` Dan Aloni 1 sibling, 0 replies; 4+ messages in thread From: Dan Aloni @ 2007-04-01 10:21 UTC (permalink / raw) To: Pedram M; +Cc: linux-kernel On Sat, Mar 31, 2007 at 01:11:29AM -0700, Pedram M wrote: > Hi, > > I've seen this around, and have heard about it in forums and else-where, > could somebody enlighten me with more information or with experiences > they have had. Looks like kswapd begins to eat CPU dramatically till the > box eventually locks up. My experience with kswapd eating a lot of CPU tells that this particular problem with Linux 2.4 manifests itself on this scenario: * No swap is configured (we are blessed with RAM). _AND_: * A lot of memory is allocated (for my case: a lot of anonymous pages used for applications). Looking at this problem with kdb, I noticed that the CPU spends a lot of time in swap_out(), even though there are no swap devices... So... mm/vmscan.c, replace swap_out with this: static int swap_out(zone_t * classzone) { return 0; } Now, this might raise some eyebrows for those MM gurus reading this mail but I assure you I've been doing this for a lot of time (and a lot of machines) on 2.4.27, and it took care of my kswapd issues quite nicely. I hope it helps... -- Dan Aloni XIV LTD, http://www.xivstorage.com da-x (at) monatomic.org, dan (at) xiv.co.il ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2007-04-01 20:28 UTC | newest]
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[not found] ` <fa.Fyq10Ks5ejO6P+77Y8svOle1kro@ifi.uio.no>
2007-04-01 20:27 ` Fwd: kswapd issues + kernel 2.4.21-32.0.1.ELsmp Robert Hancock
[not found] <9c9aa5d00703310110s2a21f19l37544c3d46be53c9@mail.gmail.com>
2007-03-31 8:11 ` Pedram M
2007-03-31 15:50 ` Rik van Riel
2007-04-01 10:21 ` Dan Aloni
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