Messages in this thread | | | Date | Wed, 31 Aug 2005 22:24:25 +1000 | From | Nick Piggin <> | Subject | Re: Where is the performance bottleneck? |
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Holger Kiehl wrote:
> 3236497 total 1.4547 > 2507913 default_idle 52248.1875 > 158752 shrink_zone 43.3275 > 121584 copy_user_generic_c 3199.5789 > 34271 __wake_up_bit 713.9792 > 31131 __make_request 23.1629 > 22096 scsi_request_fn 18.4133 > 21915 rotate_reclaimable_page 80.5699 ^^^^^^^^^
I don't think this function should be here. This indicates that lots of writeout is happening due to pages falling off the end of the LRU.
There was a bug recently causing memory estimates to be wrong on Opterons that could cause this I think.
Can you send in 2 dumps of /proc/vmstat taken 10 seconds apart while you're writing at full speed (with 2.6.13 or the latest -git tree).
A dump of /proc/zoneinfo and /proc/meminfo while the write is going on would be helpful too.
Thanks, Nick
-- SUSE Labs, Novell Inc.
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