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Date:      Fri, 16 Jan 2015 23:24:17 +0000
From:      Steven Hartland <killing@multiplay.co.uk>
To:        freebsd-stable@freebsd.org
Subject:   Re: Poor performance on Intel P3600 NVME driver
Message-ID:  <54B99DA1.2000001@multiplay.co.uk>
In-Reply-To: <54B999C6.2090909@gmail.com>
References:  <54B7F769.40605@gmail.com> <20150115175927.GA19071@zxy.spb.ru> <54B8C7E9.3030602@gmail.com> <CAKAYmM%2BEpvOYfFnF1i02aoTC2vfVT%2Bq=6XvCPBnYg-mRQAVD1A@mail.gmail.com> <CAORpBLUYzHw%2BRRccRpkcxYrnjnckRMLyAc86J9UPpirRSeWxqQ@mail.gmail.com> <20150116221344.GA72201@pit.databus.com> <54B999C6.2090909@gmail.com>

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Any difference if you disable trim?

On 16/01/2015 23:07, Mihai Vintila wrote:
> I've remade the test with atime=off. Drive has 512b physical, but I've 
> created it with 4k gnop anyway. Results are similar with atime
>         Processor cache line size set to 32 bytes.
>         File stride size set to 17 * record size.
> random  random bk wd   record   stride
>               KB  reclen   write rewrite    read    reread read write 
> re ad  rewrite     read   fwrite frewrite   fread  freread
>          1048576       4   74427       0   101744        0 93529 47925
>          1048576       8   39072       0    64693        0 61104 25452
>
> I've also tried to increase vfs.zfs.vdev.aggregation_limit and ended 
> up with a crash (screenshot attached)
>
> I'm attaching zfs tunables:
> sysctl -a|grep vfs.zfs
> vfs.zfs.arc_max: 34359738368
> vfs.zfs.arc_min: 4294967296
> vfs.zfs.arc_average_blocksize: 8192
> vfs.zfs.arc_meta_used: 5732232
> vfs.zfs.arc_meta_limit: 8589934592
> vfs.zfs.l2arc_write_max: 8388608
> vfs.zfs.l2arc_write_boost: 8388608
> vfs.zfs.l2arc_headroom: 2
> vfs.zfs.l2arc_feed_secs: 1
> vfs.zfs.l2arc_feed_min_ms: 200
> vfs.zfs.l2arc_noprefetch: 1
> vfs.zfs.l2arc_feed_again: 1
> vfs.zfs.l2arc_norw: 1
> vfs.zfs.anon_size: 32768
> vfs.zfs.anon_metadata_lsize: 0
> vfs.zfs.anon_data_lsize: 0
> vfs.zfs.mru_size: 17841664
> vfs.zfs.mru_metadata_lsize: 858624
> vfs.zfs.mru_data_lsize: 13968384
> vfs.zfs.mru_ghost_size: 0
> vfs.zfs.mru_ghost_metadata_lsize: 0
> vfs.zfs.mru_ghost_data_lsize: 0
> vfs.zfs.mfu_size: 4574208
> vfs.zfs.mfu_metadata_lsize: 465408
> vfs.zfs.mfu_data_lsize: 4051456
> vfs.zfs.mfu_ghost_size: 0
> vfs.zfs.mfu_ghost_metadata_lsize: 0
> vfs.zfs.mfu_ghost_data_lsize: 0
> vfs.zfs.l2c_only_size: 0
> vfs.zfs.dedup.prefetch: 1
> vfs.zfs.nopwrite_enabled: 1
> vfs.zfs.mdcomp_disable: 0
> vfs.zfs.dirty_data_max: 4294967296
> vfs.zfs.dirty_data_max_max: 4294967296
> vfs.zfs.dirty_data_max_percent: 10
> vfs.zfs.dirty_data_sync: 67108864
> vfs.zfs.delay_min_dirty_percent: 60
> vfs.zfs.delay_scale: 500000
> vfs.zfs.prefetch_disable: 1
> vfs.zfs.zfetch.max_streams: 8
> vfs.zfs.zfetch.min_sec_reap: 2
> vfs.zfs.zfetch.block_cap: 256
> vfs.zfs.zfetch.array_rd_sz: 1048576
> vfs.zfs.top_maxinflight: 32
> vfs.zfs.resilver_delay: 2
> vfs.zfs.scrub_delay: 4
> vfs.zfs.scan_idle: 50
> vfs.zfs.scan_min_time_ms: 1000
> vfs.zfs.free_min_time_ms: 1000
> vfs.zfs.resilver_min_time_ms: 3000
> vfs.zfs.no_scrub_io: 0
> vfs.zfs.no_scrub_prefetch: 0
> vfs.zfs.metaslab.gang_bang: 131073
> vfs.zfs.metaslab.fragmentation_threshold: 70
> vfs.zfs.metaslab.debug_load: 0
> vfs.zfs.metaslab.debug_unload: 0
> vfs.zfs.metaslab.df_alloc_threshold: 131072
> vfs.zfs.metaslab.df_free_pct: 4
> vfs.zfs.metaslab.min_alloc_size: 10485760
> vfs.zfs.metaslab.load_pct: 50
> vfs.zfs.metaslab.unload_delay: 8
> vfs.zfs.metaslab.preload_limit: 3
> vfs.zfs.metaslab.preload_enabled: 1
> vfs.zfs.metaslab.fragmentation_factor_enabled: 1
> vfs.zfs.metaslab.lba_weighting_enabled: 1
> vfs.zfs.metaslab.bias_enabled: 1
> vfs.zfs.condense_pct: 200
> vfs.zfs.mg_noalloc_threshold: 0
> vfs.zfs.mg_fragmentation_threshold: 85
> vfs.zfs.check_hostid: 1
> vfs.zfs.spa_load_verify_maxinflight: 10000
> vfs.zfs.spa_load_verify_metadata: 1
> vfs.zfs.spa_load_verify_data: 1
> vfs.zfs.recover: 0
> vfs.zfs.deadman_synctime_ms: 1000000
> vfs.zfs.deadman_checktime_ms: 5000
> vfs.zfs.deadman_enabled: 1
> vfs.zfs.spa_asize_inflation: 24
> vfs.zfs.txg.timeout: 5
> vfs.zfs.vdev.cache.max: 16384
> vfs.zfs.vdev.cache.size: 0
> vfs.zfs.vdev.cache.bshift: 16
> vfs.zfs.vdev.trim_on_init: 0
> vfs.zfs.vdev.mirror.rotating_inc: 0
> vfs.zfs.vdev.mirror.rotating_seek_inc: 5
> vfs.zfs.vdev.mirror.rotating_seek_offset: 1048576
> vfs.zfs.vdev.mirror.non_rotating_inc: 0
> vfs.zfs.vdev.mirror.non_rotating_seek_inc: 1
> vfs.zfs.vdev.max_active: 1000
> vfs.zfs.vdev.sync_read_min_active: 32
> vfs.zfs.vdev.sync_read_max_active: 32
> vfs.zfs.vdev.sync_write_min_active: 32
> vfs.zfs.vdev.sync_write_max_active: 32
> vfs.zfs.vdev.async_read_min_active: 32
> vfs.zfs.vdev.async_read_max_active: 32
> vfs.zfs.vdev.async_write_min_active: 32
> vfs.zfs.vdev.async_write_max_active: 32
> vfs.zfs.vdev.scrub_min_active: 1
> vfs.zfs.vdev.scrub_max_active: 2
> vfs.zfs.vdev.trim_min_active: 1
> vfs.zfs.vdev.trim_max_active: 64
> vfs.zfs.vdev.aggregation_limit: 131072
> vfs.zfs.vdev.read_gap_limit: 32768
> vfs.zfs.vdev.write_gap_limit: 4096
> vfs.zfs.vdev.bio_flush_disable: 0
> vfs.zfs.vdev.bio_delete_disable: 0
> vfs.zfs.vdev.trim_max_bytes: 2147483648
> vfs.zfs.vdev.trim_max_pending: 64
> vfs.zfs.max_auto_ashift: 13
> vfs.zfs.min_auto_ashift: 9
> vfs.zfs.zil_replay_disable: 0
> vfs.zfs.cache_flush_disable: 0
> vfs.zfs.zio.use_uma: 1
> vfs.zfs.zio.exclude_metadata: 0
> vfs.zfs.sync_pass_deferred_free: 2
> vfs.zfs.sync_pass_dont_compress: 5
> vfs.zfs.sync_pass_rewrite: 2
> vfs.zfs.snapshot_list_prefetch: 0
> vfs.zfs.super_owner: 0
> vfs.zfs.debug: 0
> vfs.zfs.version.ioctl: 4
> vfs.zfs.version.acl: 1
> vfs.zfs.version.spa: 5000
> vfs.zfs.version.zpl: 5
> vfs.zfs.vol.mode: 1
> vfs.zfs.trim.enabled: 0
> vfs.zfs.trim.txg_delay: 32
> vfs.zfs.trim.timeout: 30
> vfs.zfs.trim.max_interval: 1
>
> And nvm:
> ev.nvme.%parent:
> dev.nvme.0.%desc: Generic NVMe Device
> dev.nvme.0.%driver: nvme
> dev.nvme.0.%location: slot=0 function=0 handle=\_SB_.PCI0.BR3A.D08A
> dev.nvme.0.%pnpinfo: vendor=0x8086 device=0x0953 subvendor=0x8086 
> subdevice=0x370a class=0x010802
> dev.nvme.0.%parent: pci4
> dev.nvme.0.int_coal_time: 0
> dev.nvme.0.int_coal_threshold: 0
> dev.nvme.0.timeout_period: 30
> dev.nvme.0.num_cmds: 811857
> dev.nvme.0.num_intr_handler_calls: 485242
> dev.nvme.0.reset_stats: 0
> dev.nvme.0.adminq.num_entries: 128
> dev.nvme.0.adminq.num_trackers: 16
> dev.nvme.0.adminq.sq_head: 12
> dev.nvme.0.adminq.sq_tail: 12
> dev.nvme.0.adminq.cq_head: 8
> dev.nvme.0.adminq.num_cmds: 12
> dev.nvme.0.adminq.num_intr_handler_calls: 7
> dev.nvme.0.adminq.dump_debug: 0
> dev.nvme.0.ioq0.num_entries: 256
> dev.nvme.0.ioq0.num_trackers: 128
> dev.nvme.0.ioq0.sq_head: 69
> dev.nvme.0.ioq0.sq_tail: 69
> dev.nvme.0.ioq0.cq_head: 69
> dev.nvme.0.ioq0.num_cmds: 811845
> dev.nvme.0.ioq0.num_intr_handler_calls: 485235
> dev.nvme.0.ioq0.dump_debug: 0
> dev.nvme.1.%desc: Generic NVMe Device
> dev.nvme.1.%driver: nvme
> dev.nvme.1.%location: slot=0 function=0 handle=\_SB_.PCI0.BR3B.H000
> dev.nvme.1.%pnpinfo: vendor=0x8086 device=0x0953 subvendor=0x8086 
> subdevice=0x370a class=0x010802
> dev.nvme.1.%parent: pci5
> dev.nvme.1.int_coal_time: 0
> dev.nvme.1.int_coal_threshold: 0
> dev.nvme.1.timeout_period: 30
> dev.nvme.1.num_cmds: 167
> dev.nvme.1.num_intr_handler_calls: 163
> dev.nvme.1.reset_stats: 0
> dev.nvme.1.adminq.num_entries: 128
> dev.nvme.1.adminq.num_trackers: 16
> dev.nvme.1.adminq.sq_head: 12
> dev.nvme.1.adminq.sq_tail: 12
> dev.nvme.1.adminq.cq_head: 8
> dev.nvme.1.adminq.num_cmds: 12
> dev.nvme.1.adminq.num_intr_handler_calls: 8
> dev.nvme.1.adminq.dump_debug: 0
> dev.nvme.1.ioq0.num_entries: 256
> dev.nvme.1.ioq0.num_trackers: 128
> dev.nvme.1.ioq0.sq_head: 155
> dev.nvme.1.ioq0.sq_tail: 155
> dev.nvme.1.ioq0.cq_head: 155
> dev.nvme.1.ioq0.num_cmds: 155
> dev.nvme.1.ioq0.num_intr_handler_calls: 155
> dev.nvme.1.ioq0.dump_debug: 0
>
> Best regards,
> Vintila Mihai Alexandru
>
> On 1/17/2015 12:13 AM, Barney Wolff wrote:
>> I suspect Linux defaults to noatime - at least it does on my rpi.  I
>> believe the FreeBSD default is the other way.  That may explain some
>> of the difference.
>>
>> Also, did you use gnop to force the zpool to start on a 4k boundary?
>> If not, and the zpool happens to be offset, that's another big hit.
>> Same for ufs, especially if the disk has logical sectors of 512 but
>> physical of 4096.  One can complain that FreeBSD should prevent, or
>> at least warn about, this sort of foot-shooting.
>>
>> On Fri, Jan 16, 2015 at 10:21:07PM +0200, Mihai-Alexandru Vintila wrote:
>>> @Barney Wolff it's a new pool with only changes recordsize=4k and
>>> compression=lz4 . On linux test is on ext4 with default values. 
>>> Penalty is
>>> pretty high. Also there is a read penalty for read as well between 
>>> ufs and
>>> zfs. Even on nvmecontrol perftest you can see the read penalty it's not
>>> normal to have same result for both write and read
>
> _______________________________________________
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