Am 2016-10-13 um 03:41 schrieb John-Mark Gurney:
Michael Osipov wrote this message on Wed, Oct 12, 2016 at 20:54 +0200:
As if there is a bottleneck between socket read and geom write to FS.

Is that better?

Have you run gstat on the system to see if there is an IO bottle
neck?  Since you are using graid3, you want to look to see if
it's %busy is ~100, while the underlying components are not.

This is hardly impossible because as soon as I start some SFTP transfer, all of my SSH sessions free or receive connetion timeout/abort. Doing a SFTP from FreeBSD to FreeBSD gives me on both physical disks and RAID3 volume a busy of zero to one perfect. In other terms, the drives are bored.

Also, if you do dd if=/dev/zero of=/mnt/somefile bs=1m count=1024,
from the local system, are things still slow?

I have done this in the first place, this is fast:

# dd if=/dev/zero bs=1M count=10240 | pv -s 10G -treab --progress > /mnt/file.bin
10240+0 records out
10737418240 bytes transferred in 216.084333 secs (49690869 bytes/sec)
  10GiB 0:03:36 [47.4MiB/s] [47.4MiB/s] [==========================>] 100%

P.S. This is basic debugging, have to identify which part of the
system is misbehaving.

I am aware of that. Thank you.

P.P.S. Your "non-geom" test is still using geom, just not w/ the graid3

Oh ok, I wasn't aware of that. Actually, I have tried all of them: concat, stripe, mirror, gvinum. Local operations are fast, though remote still crawls slowly.


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