Slow iSCSI performance

[Stefan Lambrev]

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
>
>
>
>
>
>
>
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-- 

Best Wishes,
Stefan Lambrev
ICQ# 24134177