The current elevator_linus() doesn't obey the true elevator
scheduling, and causes I/O livelock during frequent random write
traffics. In such environment I/O (read/write) transactions may be
delayed almost infinitely (more than 1 hour).
Problem:
Current elevator_linus() traverses the I/O
The current elevator_linus() doesn't obey the true elevator
scheduling, and causes I/O livelock during frequent random write
traffics. In such environment I/O (read/write) transactions may be
delayed almost infinitely (more than 1 hour).
Problem:
Current elevator_linus() traverses the I/O
Andrew,
I got 5250 Req/s with your locks-sem.patch on normal Apache.
It is good performance on normal Apache.
Andrew Morton writes:
> Kouichi, could you please test the performance of this on
> your 8-way with Apache+fcntl serialisation? (the normal
> Apache). Please use 2.4.0-test10-pre5,
Andrew,
I got 5250 Req/s with your locks-sem.patch on normal Apache.
It is good performance on normal Apache.
Andrew Morton writes:
Kouichi, could you please test the performance of this on
your 8-way with Apache+fcntl serialisation? (the normal
Apache). Please use 2.4.0-test10-pre5, not
Based of my measurement on i386 smp configuration,
If a system has plenty of runnable tasks, schedule() produces
noticable amount of cache misses at runqueue-head traversing and the
goodness calculations.
David S. Miller writes:
> Some of us actually have instrumented it :-) I added a coloring
Based of my measurement on i386 smp configuration,
If a system has plenty of runnable tasks, schedule() produces
noticable amount of cache misses at runqueue-head traversing and the
goodness calculations.
David S. Miller writes:
Some of us actually have instrumented it :-) I added a coloring
Ingo Molnar writes:
> On Mon, 4 Sep 2000 [EMAIL PROTECTED] wrote:
> > The experiment showed the following prefetching could reduce 20-30% of
> > csum_partial_copy_generic() execution time.
>
> Please test it and post the numbers. csum_partial_copy_generic() already
> does prefetching - the
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