Messages in this thread | | | Date | Thu, 04 Apr 2002 14:29:16 -0800 | From | Andrew Morton <> | Subject | Re: Report: 2.4.18 very high latencies (with lowlat. and pre-empt patches) |
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Ricardo Galli wrote: > > Hi all (second try), > Linux becomes somehow unusable when I edited sound files and also > during NFS copy. I've noticed the same effects also during i/o loads, for > example when closing kmail after I deleted some messages. >
It would help if you could come up with a simple test case which exhibits this problem - some sequence of steps which is reproducible by others, and which has repeatable effects.
Is your I/O system performing properly? Try running
hdparm -t /dev/hdaX
where /dev/hdaX refers to your root filesystem. You should get 15-30 megabytes per second.
You also report that your PPC-based laptop has processes unexpectedly terminating when the machine is under VM pressure. You should check your kernel logs (usually /var/log/messages) to see if the process was killed due to an out-of-memory condition. If it's not that, and if it's not due to application bugs then the ppc kernel may be dropping modified- or dirty-bits in its PTEs, which is rather unlikely.
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