Message: 7
Date: Tue, 30 Oct 2012 22:03:13 +0400
From: Jim Klimov<[email protected]>
To: Discussion list for OpenIndiana
<[email protected]>
Subject:
Message-ID:<[email protected]>
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2012-10-30 19:21, Sebastian Gabler wrote:
>Whereas that's relative: performance is still at a quite miserable 62
>MB/s through a gigabit link. Apparently, my environment has room for
>improvement.
Does your gigabit ethernet use Jumbo Frames (like 9000 or up to 16KB,
depending on your NICs, switches and other networking gear) for
unrouted (L2) storage links? It is said that traditional MTU=1500
has too many overheads with packet size and preamble delays between
packets that effectively limit a gigabit to 700-800Mbps...
//Jim
------------------------------
The MTU is on 1500 on source and target system, and there are no
fragmentations happening. On the target system I am seeing writes up to
160 MB/s with frequent zpool iostat probes. When iostat probes are up to
5s+, there is a steady stream of 62 MB/s. At this time I am not sure if
that is indeed a networking issue. I am also not sure how jumbo frames
could provide an intersting benefit here. The usually alleged 15% (which
are already on the high side) are not in the scope of making or breaking
the use case.
BR
Sebastian
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