Messages in this thread | | | Date | Wed, 4 Sep 2013 16:40:22 -0400 | From | "John Stoffel" <> | Subject | Re: [PATCH] dcache: Translating dentry into pathname without taking rename_lock |
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>>>>> "Waiman" == Waiman Long <waiman.long@hp.com> writes:
Waiman> In term of AIM7 performance, this patch has a performance boost of Waiman> about 6-7% on top of Linus' lockref patch on a 8-socket 80-core DL980.
Waiman> User Range | 10-100 | 200-10000 | 1100-2000 | Waiman> Mean JPM w/o patch | 4,365,114 | 7,211,115 | 6,964,439 | Waiman> Mean JPM with patch | 3,872,850 | 7,655,958 | 7,422,598 | Waiman> % Change | -11.3% | +6.2% | +6.6% |
This -11% impact is worisome to me, because at smaller numbers of users, I would still expect the performance to go up. So why the big drop?
Also, how is the impact of these changes on smaller 1 socket, 4 core systems? Just because it helps a couple of big boxes, doesn't mean it won't hurt the more common small case.
John
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