El Miércoles, 28 de Junio de 2006 13:24, cobaco (aka Bart Cornelis) escribió: > On Wednesday 28 June 2006 12:30, André Wöbbeking wrote: > > On Wednesday 28 June 2006 12:15, cobaco (aka Bart Cornelis) wrote: > > > On Wednesday 28 June 2006 05:09, Matej Cepl wrote: > > > > Hi, > > > > > > Is anything trying to write/read large amounts of data when this > > > happens? if so you might want to: > > > - check the settings for your harddisk (notably DMA) > > > - also which filessystem are you using? reiserfs3 has problems > > > locking up the system under high load > > > > I sometimes have this problem and thought that it's related to SATA. But > > I'm using reiserfs3. Do you've more infos about its problems under high > > load. > > YMMV, I can't remember where I read the details, but the FAQ at [1] has: > Q: Why do things freeze on my IDE hard drive for annoying amounts of time > A: Because when large writes are scheduled all at once, reads can starve. A > fix for this is evolving; the later your ReiserFS patch, the better we > handle this. > > (it's been over a year since I was using reiserfs, this problem made my > laptop completely unusable for 10minutes+ when doing e.g. svn update on the > d-i repository, i finally 'fixed' it by switching to ext3, situation might > have improved since then) > > [1] http://www.namesys.com/faq.html Hello All: Here is something I have always liked to asks but I hadn't had the chance. The problem is that on my job PC, I use reiser over a LVM over a SATA disk. When I have some disk intensive tasks/intervals, my system turns not as responsive as I wish and as I think should be. In this situation, I have tried doing top on a konsole, and I find that the field "wa" in the above part of the top report, in the middle of "id" and "hi" raises to 80-90%. I don't know what exactly this field means, but I bet for cpu-wait state as it is the case in disk I/O. All of this guessing yields me to the conclusion that I'm sometimes wasting up to 90% of cpu time waiting or just doing nothing, I can't understand this. As I'm not sure about the SATA details (I'm used to PATA) I think I have the best configuration, even DMA, but this go on happening. On my laptop, which includes a Dell PATA disk, the supposed "wait" states doesn't rise bigger than 30-40%. What could be happening here? Is this normal?. Thanks for your attention. I know this is OT, but I would appreciate redirection to a possible source of information related to this. Cheers, -- Raúl Sánchez Siles ----->Proud Debian user<----- Linux registered user #416098
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