Messages in this thread | | | Date | Sat, 16 Oct 2004 05:05:04 -0700 | From | William Lee Irwin III <> | Subject | Re: [PATCH 1/2] aio: add vectored I/O support |
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On Sat, Oct 16, 2004 at 07:18:45AM +0200, Avi Kivity wrote: >> It is a huge performance win, at least on the 2.4-based RHEL kernel. >> Large reads (~256K) using 4K iocbs are very slow on a large RAID, while >> after I coded a similar patch I got a substantial speedup.
On Sat, Oct 16, 2004 at 06:37:21AM +0100, Joel Becker wrote: > I'd think we should fix the submission path instead. Why create > iovs _and_ iocbs when we only need to create one? And even if we > decided aio_readv() was still nice to keep, we'd want to fix this > inefficiency in io_submit().
Disk I/O can vector across iocb's; however, network I/O requires temporal ordering not imposed by sequential iocb submission, barring unusual extensions to the semantics.
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