Messages in this thread | | | Date | Tue, 16 Mar 2004 18:46:44 +1100 | From | Nick Piggin <> | Subject | Re: [PATCH] per-backing dev unplugging #2 |
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Jeremy Higdon wrote:
>On Tue, Mar 16, 2004 at 05:36:18PM +1100, Nick Piggin wrote: > >> >>Jeremy Higdon wrote: >> >> >>>My tests were on an 8 CPU x 1300 MHz Altix with 64 disks. >>> >>> >>> >>Nice - so if you had enough IO capacity to saturate the CPUs it >>might come close to a 4x improvement - and this sounds like one >>of your baby systems? >> > >Baby by cpu count, mid size by I/O capability. Extrapolations of >this sort are fraught with peril. However, it is conceivable that >we would end up with 4X the IOPS. > >
Well, it is more than 2x! What does a profile look like after the patch, I wonder?
>>I wonder why nobody's complained about this before? >> > >Well, some of us have, but probably not very loudly. I had >naively believed that the global unplug was gone in 2.6. > >
I wasn't talking about SGI in particular, I just remember people being very worried about making sure we can support *thousands* of queues quite a while back.
Anyway, it's done now. And Jens' patch turned out to be pretty simple and probably makes the code cleaner, anyway.
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