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SubjectRe: [PATCH] proposed scheduler enhancements and fixes

On 28-Feb-2000 Andrea Arcangeli wrote:
> On Sat, 26 Feb 2000, Dimitris Michailidis wrote:
>>This was MP (4 Xeon @500MHz). As another data point, on the same machine,
>>dbench 32 has a throughput of about 42MB/s with 2.3.40. With stock 2.3.47
>>it's just under 7MB/s and the CPUs have a much lower utilization (27% out
>>of the 4 CPUs versus 100+% with 2.3.40).

Some more info on this. With lighter load (dbench 8) I notice about 30%
drop in throughput with 2.3.47 when the buffer cache is cold. With warm
cache both kernels perform similarly. With dbench 32 the cold case shows
higher degradation (as noted above) and running with warm cache doesn't help.

> Please try again after:
> echo 95 > /proc/sys/vm/bdflush

OK, I tried this. Didn't do much.

Dimitris Michailidis

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