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Make zio_taskq_batch_pct user configurable 

Adds zio_taskq_batch_pct as an exported module parameter,
allowing users to modify it at module load time.

Signed-off-by: DHE <git@dehacked.net>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4110
This commit is contained in:
DHE 2015-12-16 14:22:32 -05:00 committed by Brian Behlendorf
parent 82dba185c8
commit dcb6bed1df
2 changed files with 23 additions and 1 deletions
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17
man/man5/zfs-module-parameters.5
View File

@ -1598,6 +1598,23 @@ Prioritize requeued I/O
Default value: \fB0\fR.
.RE
.sp
.ne 2
.na
\fBzio_taskq_batch_pct\fR (uint)
.ad
.RS 12n
Percentage of online CPUs (or CPU cores, etc) which will run a worker thread
for IO. These workers are responsible for IO work such as compression and
checksum calculations. Fractional number of CPUs will be rounded down.
.sp
The default value of 75 was chosen to avoid using all CPUs which can result in
latency issues and inconsistent application performance, especially when high
compression is enabled.
.sp
Default value: \fB75\fR.
.RE
.sp
.ne 2
.na

7
module/zfs/spa.c
View File

@ -867,7 +867,7 @@ spa_taskqs_init(spa_t *spa, zio_type_t t, zio_taskq_type_t q)
case ZTI_MODE_BATCH:
batch = B_TRUE;
flags |= TASKQ_THREADS_CPU_PCT;
value = zio_taskq_batch_pct;
value = MIN(zio_taskq_batch_pct, 100);
break;
default:
@ -6804,4 +6804,9 @@ MODULE_PARM_DESC(spa_load_verify_metadata,
module_param(spa_load_verify_data, int, 0644);
MODULE_PARM_DESC(spa_load_verify_data,
"Set to traverse data on pool import");
module_param(zio_taskq_batch_pct, uint, 0444);
MODULE_PARM_DESC(zio_taskq_batch_pct,
"Percentage of CPUs to run an IO worker thread");
#endif