Messages in this thread | | | Subject | Re: bad command responsiveness Proliant DL 585 | From | Mike Galbraith <> | Date | Wed, 14 Jun 2006 11:42:41 +0200 |
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On Wed, 2006-06-14 at 09:59 +0200, David Osojnik wrote: > Hello, > > We have a problem with four HP Proliant DL 585 servers with 4 AMD > Opteron processors and 16Gb of memory and 3x 300Gb U320 SCSI disks and > with all the latest firmware. we noticed bad command responsiveness in > an production environment and poor performance (web server and mysql) > The problem is good reproducible if creating a large file 30Gb in size with: > > time dd if=/dev/zero of=test.file bs=3072 count=10240000 > > on the root partition no matter which one reiserfs, ext3 > > what happens is I open three more console windows and do random commands > like: "ls, w, route -n, ifconfig" but the commands freezes for random > time (this time is from 1 minute to 15minutes!! per command execution > time) when the command starts working (after 5minutes) i try it again > and the command freezes again for a random time... the strange thing is > that if one command freezes all other commands freeze too when one > starts to work others work too. (if running top it stops refreshing for > the lockup period)
Does top freeze if started from an mlockall(MCL_PRESENT|MCL_FUTURE) shell running at realtime priority?
Try SysRq-T and SysRq-M during freezes to gather info about VM and task state during freeze.
-Mike
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