Re: 2.6.12-mm1 & 2K lun testing (JFS problem ?)

From: Badari Pulavarty
Date: Wed Jun 22 2005 - 11:30:28 EST

Hi Wli,

Okay. Let me go through all the tests one more time with collecting
data. I will compare raw vs filesystem writes with dirty ratio
tuning. I will provide vmstat, slabinfo, meminfo, profile data
for each of those. You need anything else ?

BTW, I will send the data offline. I don't want to polute the
list with megabytes of data.


On Tue, 2005-06-21 at 18:41 -0700, William Lee Irwin III wrote:
> On Tue, Jun 21, 2005 at 05:34:54PM -0700, Badari Pulavarty wrote:
> > Hi Andrew & Shaggy,
> > Here is the summary of 2K lun testing on 2.6.12-mm1.
> > When I tune dirty ratios and CFQ queue depths, things
> > seems to be running fine.
> > echo 20 > /proc/sys/vm/dirty_ratio
> > echo 20 > /proc/sys/vm/overcommit_ratio
> > echo 4 > /sys/block/<device>/queue/nr_requests
> > But, I am running into JFS problem. I can't kill my
> > "dd" process. They all get stuck in:
> > (I am going to try ext3).
> If you could get unabridged profiling data for raw vs. fs (so it can
> be properly sorted) I would be interested in that. Early indications
> were large amounts of time spent in shrink_zone(), obtained by
> re-sorting the truncated profile listings. It indicated the time spent
> in shrink_zone() was 26.3 times as much time spent in default_idle().
> Typically copying to and from userspace are enormous overheads, but
> aren't observable in the truncated/mis-sorted profiles, which calls
> them into question, barring unreported usage of O_DIRECT. There are
> also no totals reported, which are helpful for interpreting realtime
> behavior.
> -- wli
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