Did you re-run the dd tests after tweaking those parameters?
On Feb 22, 2017 11:52 AM, "Will Beazley" <[email protected]> wrote: Mille Grazie! On 2/21/17 23:12, Artem Penner wrote: Read about this kernel parameters zfs:zfs_dirty_data_max zfs:zfs_txg_timeout zfs:zfs_dirty_data_sync It's limut your i/o. Example of /etc/config set ibft_noprobe=1 set noexec_user_stack=1 set noexec_user_stack_log=1 set idle_cpu_no_deep_c=1 set idle_cpu_prefer_mwait = 0 set hires_tick=1 set ip:ip_squeue_fanout=1 set pcplusmp:apic_panic_on_nmi=1 set apix:apic_panic_on_nmi=1 set dump_plat_mincpu=0 set dump_bzip2_level=1 set dump_metrics_on=1 set sata:sata_auto_online=1 set sd:sd_max_throttle = 128 set sd:sd_io_time=10 set rlim_fd_max = 131072 set rlim_fd_cur = 65536 set ndd:tcp_wscale_always = 1 set ndd:tstamp_if_wscale = 1 set ndd:tcp_max_buf = 166777216 set nfs:nfs_allow_preepoch_time = 1 set nfs:nfs3_max_threads = 256 set nfs:nfs4_max_threads = 256 set nfs:nfs3_nra = 32 set nfs:nfs4_nra = 32 set nfs:nfs3_bsize = 1048576 set nfs:nfs4_bsize = 1048576 set nfs3:max_transfer_size = 1048576 set nfs4:max_transfer_size = 1048576 set nfs:nfs4_async_clusters = 16 set rpcmod:svc_default_stksize=0x6000 set rpcmod:cotsmaxdupreqs = 4096 set rpcmod:maxdupreqs = 4096 set rpcmod:clnt_max_conns = 8 set maxphys=1048576 set zfs:zfs_dirty_data_max = 0x600000000 set zfs:zfs_txg_timeout = 0xc set zfs:zfs_dirty_data_sync = 0x400000000 set zfs:zfs_arc_max = 0x6400000000 set zfs:zfs_arc_shrink_shift=12 set zfs:l2arc_write_max = 0x6400000 set zfs:l2arc_write_boost = 0xC800000 set zfs:l2arc_headroom = 12 set zfs:l2arc_norw=0 22 февр. 2017 г. 7:28 пользователь "Will Beazley" < [email protected]> написал: > Christopher, et al., > > I am trying to get my head around why the performance of ramdisk is so > much poorer than that of HDD-pool+SSD-slog. > > /usbkey/test_dir]# time dd if=/dev/zero of=/tmpfs/testfile bs=64k > count=32768;time dd if=/dev/zero of=/usbkey/test_dir/testfile bs=64k > count=32768 > 32768+0 records in > 32768+0 records out > 2147483648 <(214)%20748-3648> bytes transferred in 2.279053 secs > (942270169 bytes/sec) > > real 0m2.312s > user 0m0.021s > sys 0m1.062s > 32768+0 records in > 32768+0 records out > 2147483648 <(214)%20748-3648> bytes transferred in 0.743729 secs > (2887453957 bytes/sec) > > real 0m0.760s > user 0m0.016s > sys 0m0.652s > > I created the ramdisk thus: > ramdiskadm -a rd1 3072m > ... > zfs create -o mountpoint=/tmpfs -o sync=disabled ramdsk1/rd1 > > I've run it many times and although the results vary yet the tale is > always the same. > > Thank You, > Will > *smartos-discuss* | Archives <https://www.listbox.com/member/archive/184463/=now> <https://www.listbox.com/member/archive/rss/184463/27825507-82e246d1> | Modify <https://www.listbox.com/member/?&;> Your Subscription <http://www.listbox.com> ------------------------------------------- smartos-discuss Archives: https://www.listbox.com/member/archive/184463/=now RSS Feed: https://www.listbox.com/member/archive/rss/184463/25769125-55cfbc00 Modify Your Subscription: https://www.listbox.com/member/?member_id=25769125&id_secret=25769125-7688e9fb Powered by Listbox: http://www.listbox.com
