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Slow iSCSI performance



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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