Re: IO scheduling problem in 2.3.99-pre6

From: Shane Shrybman (
Date: Thu Apr 27 2000 - 10:23:31 EST


I am testing kernel 2.3.99pre6-7 + Rik's latest VM patch. This patch
is a improvement over other .99 kernels. However, I am seeing poor
performance during bonnie runs. I have put my vmstat log of a
bonnie -s 150 run at:

This was on a Quantum EL ide disk, in a Athlon 600 box with 128MB

During the run the system became sluggish and wasn't able to keep up
my mouse movements. Top showed that kswapd was very busy and consuming
a lot of cpu - up to 90%, but usually between 30% and 60%. Also, bonnie
reported a very good block read rate(~10MB/s) but, very slow block write

I hope this info is of some use, of course more info is available on


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