Date: Wed, 27 Feb 2008 13:54:06 +0200 From: Stefan Lambrev <stefan.lambrev@moneybookers.com> To: Philip Murray <pmurray@nevada.net.nz> Cc: freebsd-performance@freebsd.org Subject: Re: Slow iSCSI performance Message-ID: <47C54F5E.4040903@moneybookers.com> In-Reply-To: <DBBEFF37-6BFA-4898-A088-D95CEF591979@nevada.net.nz> References: <DBBEFF37-6BFA-4898-A088-D95CEF591979@nevada.net.nz>
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Greeting, Philip Murray wrote: > 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. I have similar experience. In my case I was using for initiator Linux host and FreeBSD with iscsi-target from ports. I didn't have enough time to dig where the problem is. > > 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 > > > > > > > > _______________________________________________ > freebsd-performance@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-performance > To unsubscribe, send any mail to > "freebsd-performance-unsubscribe@freebsd.org" -- Best Wishes, Stefan Lambrev ICQ# 24134177
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