Messages in this thread | | | Date | Fri, 17 Jun 2005 14:13:31 -0700 | From | Andrew Morton <> | Subject | Re: 2.6.12-rc6-mm1 & 2K lun testing |
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Badari Pulavarty <pbadari@us.ibm.com> wrote: > > > It shouldn't be necessary to do both. Either the patch or the tuning > > should fix it. Please confirm. > > > > Also please determine whether the deep CFQ queue depth is a problem when > > the VFS tuning/patching is in place. > > > > IOW: let's work out which of these three areas needs to be addressed. > > > > Andrew, > > Sorry for not getting back earlier. I am running into weird problems. > When running "dd" write tests to 2048 ext3 filesystems, just with your > patch (no dirty ratio or CFS queue depth tuning), I see "buff" > increasing instead of "cache" and I see "bi" instead of "bo". > Whats going on here ?
Beats me. Are you sure you're not running a broken vmstat?
`buff' would increase if you were accidentally writing to /dev/sda1 rather than /dev/sda1/some-filename, but I don't know why vmstat would be getting confused over the direction of the I/O.
> > procs -----------memory---------- ---swap-- -----io---- --system-- > ----cpu---- > r b swpd free buff cache si so bi bo in cs us > sy id wa > .. > 2 0 4 6339920 42712 24884 0 0 0 19 413 1237 46 > 6 48 0
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