Messages in this thread | | | Subject | Re: I/O issues, iowait problems, 2.4 v 2.6 | From | Paul Venezia <> | Date | 10 Nov 2003 23:22:33 -0500 |
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> > 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
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