Re: [RFC][PATCH] Reduce ext3 allocate-with-reservation lock latencies

[Mingming Cao <cmm@us.ibm.com>]

On Wed, 2005-04-27 at 23:45 -0400, Lee Revell wrote:
> On Fri, 2005-04-22 at 15:10 -0700, Mingming Cao wrote:
> > Please review. I have tested on fsx on SMP box. Lee, if you got time,
> > please try this patch.
> 
> I have tested and this does fix the problem.  I ran my tests and no ext3
> code paths showed up on the latency tracer at all, it never went above
> 33 usecs.
> 
Thanks, Lee.

The patch survived on many fsx test over 20 hours on a 2cpu machine.
Tested the patch on the same machine with tiobench (1-64 threads), and
untar a kernel tree test, no regression there.
However I see about 5-7% throughput drop on dbench with 16 threads. It
probably due to the cpu cost that we have discussed.


Mingming

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