Re: [Lse-tech] Re: (RFC): SKB Initialization

From: William Lee Irwin III (
Date: Thu Aug 22 2002 - 17:05:25 EST

On Thu, Aug 22, 2002 at 12:02:27PM -0700, Dave Hansen wrote:
> You can see the entire readprofile here:
> No, I don't know why I have so much idle time.

Hmm, I found that tiobench was spending a lot of time idle due to
__wait_on_inode() and get_request_wait(). I bumped up the size of
the inode wait table to 1024 and the request queue size to 16384
and saw that most of them then spent their time stuck on ->i_sem
during the initial open of the file they were going to pound on
for the duration of the run.

I determined this by just ^C'ing with kgdb and backtracing various
"stuck" processes. I think various profiling patches might be able to
give you an idea of what people are going to sleep on too.

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