diff options
Diffstat (limited to 'scripts/zpios-survey.sh')
| -rwxr-xr-x | scripts/zpios-survey.sh | 30 |
1 files changed, 1 insertions, 29 deletions
diff --git a/scripts/zpios-survey.sh b/scripts/zpios-survey.sh index cb751b467..78601695f 100755 --- a/scripts/zpios-survey.sh +++ b/scripts/zpios-survey.sh @@ -120,40 +120,13 @@ zpios_survey_pending() { tee -a ${ZPIOS_SURVEY_LOG} } -# To avoid memory fragmentation issues our slab implementation can be -# based on a virtual address space. Interestingly, we take a pretty -# substantial performance penalty for this somewhere in the low level -# IO drivers. If we back the slab with kmem pages we see far better -# read performance numbers at the cost of memory fragmention and general -# system instability due to large allocations. This may be because of -# an optimization in the low level drivers due to the contigeous kmem -# based memory. This needs to be explained. The good news here is that -# with zerocopy interfaces added at the DMU layer we could gaurentee -# kmem based memory for a pool of pages. -# -# 0x100 = KMC_KMEM - Force kmem_* based slab -# 0x200 = KMC_VMEM - Force vmem_* based slab -zpios_survey_kmem() { - TEST_NAME="${ZPOOL_CONFIG}+${ZPIOS_TEST}+kmem" - print_header ${TEST_NAME} - - ${ZFS_SH} ${VERBOSE_FLAG} \ - zfs="zio_bulk_flags=0x100" | \ - tee -a ${ZPIOS_SURVEY_LOG} - ${ZPIOS_SH} ${VERBOSE_FLAG} -c ${ZPOOL_CONFIG} -t ${ZPIOS_TEST} | \ - tee -a ${ZPIOS_SURVEY_LOG} - ${ZFS_SH} -u ${VERBOSE_FLAG} | \ - tee -a ${ZPIOS_SURVEY_LOG} -} - # Apply all possible turning concurrently to get a best case number zpios_survey_all() { TEST_NAME="${ZPOOL_CONFIG}+${ZPIOS_TEST}+all" print_header ${TEST_NAME} ${ZFS_SH} ${VERBOSE_FLAG} \ - zfs="zfs_vdev_max_pending=1024" \ - zfs="zio_bulk_flags=0x100" | \ + zfs="zfs_vdev_max_pending=1024" | \ tee -a ${ZPIOS_SURVEY_LOG} ${ZPIOS_SH} ${VERBOSE_FLAG} -c ${ZPOOL_CONFIG} -t ${ZPIOS_TEST} \ -o "--noprefetch --zerocopy" \ @@ -209,7 +182,6 @@ zpios_survey_prefetch zpios_survey_zerocopy zpios_survey_checksum zpios_survey_pending -zpios_survey_kmem zpios_survey_all exit 0 |