Messages in this thread | | | Date | Thu, 23 Jun 2005 11:30:51 -0700 (PDT) | From | <> | Subject | Re: cfq misbehaving on 2.6.11-1.14_FC3 |
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--- Jens Axboe <axboe@suse.de> wrote: > Journalled file systems will behave worse for this, because it has to > tend to the journal as well. Can you try mounting that partition as ext2 > and see what numbers that gives you?
I did the tests again on a partition that I could mkfs/mount at will.
On ext3, I get about 33 seconds average latency.
And on ext2, as predicted, I have latencies in average of about 0.4 seconds.
I also tried reiserfs, and it gets about 22 seconds latency.
As you pointed out, it seems that there is a flow in the way IO queues and journals (that are in some ways queues as well), interact in the presence of flushes.
Nicolas
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