lkml.org 
[lkml]   [2003]   [Nov]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: I/O issues, iowait problems, 2.4 v 2.6
From
Date

>
> Well that's nice and simple. Could you please run `vmstat 1' during that
> big `dd'? Wait for everything to achieve steady state, send us twenty
> lines of the vmstat trace?

I'd pulled this before, here's the output.

> >
> > I'd done bonnie++ i/o tests already, and except for an apparent NPTL issue on the per char,
> > the block i/o numbers were fine; no abnormal results whatsoever. In fact, block r/w
> > numbers were improved compared to 2.4.22. Now that I'm looking for it, however, I
> > do note extremely elevated iowait numbers during a bonnie++ run. Something in the MPT
> > modules?
>
> Greater than 90% I/O wait is to be expected in these tests. What is of
> interest is the overall bandwidth.2.5 megabytes per second is very broken.

Definitely. I should have noted that the 2.4.22 tests on that dd came
back in 23.607s, the 2.6.0 tests hadn't returned for over 4 minutes.

> 2.5 megabytes per second is very
> broken. I have a 53c1030 box here which uses the MPT fusion driver and it
> happily does 50MB/sec to a single disk, but I guess that's a different
> setup.

This is a 53C1030 with a RAID1 mirror. Now that I think about it, I did
the >2GB bonnie tests on a single disk, no mirror. I'll rerun the i/o
tests with this setup and then remove the mirror and see what happens.

-Paul

-
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 13:58    [W:0.237 / U:0.820 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site