Messages in this thread | | | Date | Tue, 28 Aug 2001 07:01:16 +0200 (CEST) | From | Mike Galbraith <> | Subject | Re: [resent PATCH] Re: very slow parallel read performance |
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On Tue, 28 Aug 2001, Dieter N|tzel wrote:
> * readahead do not show dramatic differences > * killall -STOP kupdated DO > > Yes, I know it is dangerous to stop kupdated but my disk show heavy thrashing > (seeks like mad) since 2.4.7ac4. killall -STOP kupdated make it smooth and > fast, again.
Interesting.
A while back, I twiddled the flush logic in buffer.c a little and made kupdated only handle light flushing.. stay out of the way when bdflush is running. This and some dynamic adjustment of bdflush flushsize and not stopping flushing right _at_ (biggie) the trigger level produced very interesting improvements. (very marked reduction in system time for heavy IO jobs, and large improvement in file rewrite throughput)
-Mike
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