diff options
| author | Alexander Motin <[email protected]> | 2024-05-03 12:53:34 -0400 |
|---|---|---|
| committer | GitHub <[email protected]> | 2024-05-03 09:53:34 -0700 |
| commit | 04bae5ec95f7273105237159a882d5b72ec2b998 (patch) | |
| tree | 55f779e57c469b7ceee392af89e0a1d016ac62c5 /man | |
| parent | 8f1b7a6fa6762ea4c89198ceb11c521f80b92ddc (diff) | |
Disable high priority ZIO threads on FreeBSD and Linux
High priority threads are handling ZIL writes. While there is no
ZIL compression, there is encryption, checksuming and RAIDZ math.
We've found that on large systems 1 taskq with 5 threads can be
a bottleneck for throughput, IOPS or both. Instead of just bumping
number of threads with a risk of overloading CPUs and increasing
latency, switch to using TQ_FRONT mechanism to increase sync write
requests priority within standard write threads. Do not do it on
Illumos, since its TQ_FRONT implementation is inherently unfair.
FreeBSD and Linux don't have this problem, so we can do it there.
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Rob Norris <[email protected]>
Signed-off-by: Alexander Motin <[email protected]>
Sponsored-By: iXsystems, Inc.
Closes #16146
Diffstat (limited to 'man')
| -rw-r--r-- | man/man4/zfs.4 | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/man/man4/zfs.4 b/man/man4/zfs.4 index 5edd80659..6895a2a6d 100644 --- a/man/man4/zfs.4 +++ b/man/man4/zfs.4 @@ -2367,7 +2367,7 @@ This is an advanced debugging parameter. Don't change this unless you understand what it does. Set values only apply to pools imported/created after that. . -.It Sy zio_taskq_write Ns = Ns Sy sync fixed,1,5 scale fixed,1,5 Pq charp +.It Sy zio_taskq_write Ns = Ns Sy sync null scale null Pq charp Set the queue and thread configuration for the IO write queues. This is an advanced debugging parameter. Don't change this unless you understand what it does. |