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On Sat, 31 Jul 1999, Benno Senoner wrote:
> as Roger Larrson suspected, there are some parts in the kernel
> which have a too long execution path:
> On his PPro with 512MB RAM, d_lookup takes up to 80ms to execute !
yes. I've attached a patch that is supposed to make things much better.
There are numerous places in the kernel that do not time-limit scheduling
latencies. [Some of my solutions are too 'heavy', and some places are
identified but not yet fixed - i'm still working on this.]
if you could test various workloads with the lowlatency-2.2.10-M6 patch
applied that would be great - i might have missed some places.
[the reason why you see bigger latencies with more memory is the dcache
and prune_dcache() - we often iterate over all dentries, which can be in
the several thousands. It's not easy to fix this, but i've got something
already. There are lots of other, more subtle latencies within the
kernel.]
i'm developing this patch under 2.2.10 so that people can test things out
easily, but i'll port this to 2.3 once latencies have reached an adequate
level. I've killed all latencies that were bigger than 1msec on my box.
-- mingo
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