lkml.org 
[lkml]   [2002]   [Aug]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [Lse-tech] Re: (RFC): SKB Initialization
On Thu, Aug 22, 2002 at 12:02:27PM -0700, Dave Hansen wrote:
> You can see the entire readprofile here:
> http://www.sr71.net/~specweb99/run-specweb-100sec-2400-2.5.31-bk+4-kmap-08-22-2002-11.20.17/
> http://www.sr71.net/~specweb99/run-specweb-100sec-2400-2.5.31-bk+4-kmap-mala-08-22-2002-11.44.25/
> 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.


Cheers,
Bill
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:28    [W:0.086 / U:0.100 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site