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SubjectRe: Strange dcache memory pressure when highmem enabled
On Thursday October 16, andrea@suse.de wrote:
>
> I wonder if what he's suffering from is a reduced normal zone due the
> mem_map_t being larger. The reduced normal zone will trigger the dcache
> shrinking more frequently. But he may want to try again with 2.4.23pre7
> with a classzone aware refill_inactive that will ensure the inactive
> list has enough lowmem pages before shrink_caches claims failure.
>

I didn't end up trying Andrew's patch, but tried 2.4.23-pre7 instead.
It appears to be doing the right thing.
Free Highmem (grep HighFree /proc/meminfo) steadily dropped from 3Gig
to about 2-3 Meg and stayed there.
The dentry cache (grep dentry_cache /proc/slabinfo) climbed up to
about 500,000 and stayed there for 24 hours - much better than before
where it would often be only a few thousand and we had complaints every
night when the backups ran.

Thanks.

NeilBrown
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