45579c9515
When doing a read from disk, ZFS creates 3 ZIO's: a zio_null(), the logical zio_read(), and then a physical zio. Currently, each of these results in a separate taskq_dispatch(zio_execute). On high-read-iops workloads, this causes a significant performance impact. By processing all 3 ZIO's in a single taskq entry, we reduce the overhead on taskq locking and context switching. We accomplish this by allowing zio_done() to return a "next zio to execute" to zio_execute(). This results in a ~12% performance increase for random reads, from 96,000 iops to 108,000 iops (with recordsize=8k, on SSD's). Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed by: George Wilson <george.wilson@delphix.com> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> External-issue: DLPX-59292 Closes #7736 |
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| .. | ||
| linux | ||
| sys | ||
| Makefile.am | ||
| libnvpair.h | ||
| libuutil.h | ||
| libuutil_common.h | ||
| libuutil_impl.h | ||
| libzfs.h | ||
| libzfs_core.h | ||
| libzfs_impl.h | ||
| zfeature_common.h | ||
| zfs_comutil.h | ||
| zfs_deleg.h | ||
| zfs_fletcher.h | ||
| zfs_namecheck.h | ||
| zfs_prop.h | ||
| zpios-ctl.h | ||
| zpios-internal.h | ||