On Thu, 1 Sep 2005, Nick Piggin wrote:
Holger Kiehl wrote:
meminfo.dump:
MemTotal: 8124172 kB
MemFree: 23564 kB
Buffers: 7825944 kB
Cached: 19216 kB
SwapCached: 0 kB
Active: 25708 kB
Inactive: 7835548 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 8124172 kB
LowFree: 23564 kB
SwapTotal: 15631160 kB
SwapFree: 15631160 kB
Dirty: 3145604 kB
Hmm OK, dirty memory is pinned pretty much exactly on dirty_ratio
so maybe I've just led you on a goose chase.
You could
echo 5 > /proc/sys/vm/dirty_background_ratio
echo 10 > /proc/sys/vm/dirty_ratio
To further reduce dirty memory in the system, however this is
a long shot, so please continue your interaction with the
other people in the thread first.
Yes, this does make a difference, here the results of running
dd if=/dev/full of=/dev/sd?1 bs=4M count=4883
on 8 disks at the same time:
34.273340
33.938829
33.598469
32.970575
32.841351
32.723988
31.559880
29.778112
That's 32.710568 MB/s on average per disk with your change and without
it it was 24.958557 MB/s on average per disk.
I will do more tests tomorrow.
Thanks,
Holger
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