| Date | Wed, 31 Jul 2013 13:51:36 +0400 | From | Maxim Patlasov <> | Subject | Re: [PATCH V8 00/33] loop: Issue O_DIRECT aio using bio_vec |
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07/31/2013 01:28 AM, Andrew Morton пишет: > On Thu, 25 Jul 2013 12:50:26 -0500 Dave Kleikamp <dave.kleikamp@oracle.com> wrote: > >> This patch series adds a kernel interface to fs/aio.c so that kernel code can >> issue concurrent asynchronous IO to file systems. It adds an aio command and >> file system methods which specify io memory with pages instead of userspace >> addresses. >> >> This series was written to reduce the current overhead loop imposes by >> performing synchronus buffered file system IO from a kernel thread. These >> patches turn loop into a light weight layer that translates bios into iocbs. > Do you have any performance numbers? > > Does anyone care much about loop performance? What's the value here? > >
OpenVZ uses loopback-device to keep per-container filesystems. We care much about overhead introduced by loop: IO-bound applications run on top of per-container filesystem shouldn't perform worse than on top of host filesystem. So the value for us is zero overhead.
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