Date: Thu, 28 Feb 2008 00:09:04 +1300 From: Philip Murray <pmurray@nevada.net.nz> To: freebsd-performance@freebsd.org Subject: Slow iSCSI performance Message-ID: <DBBEFF37-6BFA-4898-A088-D95CEF591979@nevada.net.nz>
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Hi,
I'm trying to use the new iSCSI initiator (thanks!) with 7, but I'm
getting dismal performance. A simple dd will will max out at about 2MB/
sec, and untarring the likes of the ports tree is a painful task.
The target is another FreeBSD 7 machine running the NetBSD target
daemon from ports exporting a ZVOL from ZFS (also tried with a file on
UFS).
It'll start off relatively fast and then suddenly dies after a few
seconds, and then eventually will start again:
tty da0 da1
pass0 cpu
tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy
in id
0 78 63.90 494 30.80 0.00 0 0.00 0.00 0 0.00 0 0
5 2 93
0 77 63.89 575 35.90 0.00 0 0.00 0.00 0 0.00 0 0
8 3 89
0 77 63.86 581 36.26 0.00 0 0.00 0.00 0 0.00 0 0
5 4 91
0 77 63.64 268 16.64 0.00 0 0.00 0.00 0 0.00 0 0
3 2 95
0 77 0.00 0 0.00 0.00 0 0.00 0.00 0 0.00 0 0
0 0 100
0 77 0.00 0 0.00 0.00 0 0.00 0.00 0 0.00 0 0
0 0 100
The two hosts are connected with GbE, and iperf can saturate it
without trouble (~987Mb/sec in both directions).
Any ideas where to start looking for the culprit?
Cheers
Phil
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