Richard,
I echoed your comments in my tome like email expressing that I wasn't
keen on making the changes to the systems I have, nothing I can just
through away. However, I understand that Humberto has a system that can
be used for testing.
I understand that it is important for wiser folks to at important times
to give us «All hope abandon, ye who enter here » warning lest learners
not see the gravity and consequences of their undertakings.
Or, when things go really really badly, as they sometimes do, and folks
start reflecting back, "didn't someone warn me about this?", one can
think back to these warnings.
Over time I have become gun-shy trying on try things like this, now if I
could extend that to writing and then sending inane emails to lists
saying trifling things...... :P
On 2/24/17 17:37, Richard Elling wrote:
This is what we call an "/etc/system virus"
Unless you understand each of the tunables and what they impact, do
yourself a favor
and avoid putting them on your system. In some cases, they are
documented in the
Solaris kernel tunables guide, in other cases they are documented only
in source code.
— richard
On Feb 23, 2017, at 10:47 AM, Humberto Ramirez <[email protected]
<mailto:[email protected]>> wrote:
Did you re-run the dd tests after tweaking those parameters?
On Feb 22, 2017 11:52 AM, "Will Beazley" <[email protected]
<mailto:[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]
<mailto:[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 <tel:%28214%29%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 <tel:%28214%29%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
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