Messages in this thread | | | Date | Fri, 18 May 2007 15:12:59 -0700 | From | Andrew Morton <> | Subject | Re: aio is unlikely |
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On Fri, 18 May 2007 17:54:32 -0400 Phillip Susi <psusi@cfl.rr.com> wrote:
> Andrew Morton wrote: > > Yes, if you agree with Jeff's original point. > > > > But I don't, actually. Sure, on some machines+workloads, AIO is more > > common than sync IO. But I expect that when we sum across all the > > machines+workloads in the world, sync IO is more common and is hence the > > case we should optimise for. > > > > That's assuming that the unlikely() actually does something. > > But as Jeff said, that's not what unlikely is for. It should only be > used when it is unlikely for everybody, all the time, because when it is > right, it helps rather little, but when it is wrong, it hurts a lot.
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