Abysmally slow write to geom class volume over network

[Michael Osipov]

Am 2016-10-06 um 20:34 schrieb Michael Osipov:
> Hi folks,
>
> I am experiecing a performance breakdown when writing to some geom class
> volume over network. I have tried SCP/SFTP, SMB, nc, ggated/ggatec from
> Windows 10 and FreeBSD 10.3-RELEASE and I receive at most 500 kB/s.
> Reading is superfast as well as writing to a regular, non-geom volume,
> network is fully saturated.
>
> I am on:
> # uname -a
> FreeBSD bsd1home 10.3-RELEASE-p7 FreeBSD 10.3-RELEASE-p7 #0: Thu Aug 11
> 18:37:29 UTC 2016
> root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  i386
>
> Any idea what the problem is? How can I investigate on the penality in
> performance?

FWIW, this problem is unlikely rooted in geom at all. I have added a 
second NIC into the machine, Reatek 8139 rl0 (yes -- I know it's crap), 
and performed the same setup: maximum speed. Conclusion for me is rather 
my NIC is broken or the driver. I suspect the driver to be.
The link state was going down and up over and over again. The same issue 
has been reported here [1], [2] a couple of years ago.

I will repost this to freebsd-net or rather to bugs.freebsd.org

Michael

[1] http://forums.nas4free.org/viewtopic.php?t=3606
[2] http://www.mail-archive.com/freebsd-net@freebsd.org/msg11038.html