Here is the dd command : time dd if=/dev/zero bs=1024k of=/mnt/iscsi/
10gfile.txt count=10240

Here are the cpu values :
Cpu(s):  0.0%us,  8.7%sy,  0.0%ni, 25.0%id, 64.0%wa,  0.4%hi,
1.9%si,  0.0%st -> Client
Cpu(s):  0.6%us,  2.8%sy,  0.0%ni, 86.4%id,  9.7%wa,  0.0%hi,
0.4%si,  0.0%st -> SAN

I have not tried the nullio LUN from the target... I'm not sure how to
go about this ...?

Thank you for your help.

On Nov 25, 5:04 am, Pasi Kärkkäinen <> wrote:
> On Tue, Nov 24, 2009 at 08:07:12AM -0800, Chris K. wrote:
> > Hello,
> >     I'm writing in regards to the performance with open-iscsi on a
> > 10gbe network. On your website you posted performance results
> > indicating you reached read and write speeds of 450 MegaBytes per
> > second.
> > In our environment we use Myricom dual channel 10gbe network cards on
> > a gentoo linux system connected via fiber to a 10gbe interfaced SAN
> > with a raid 0 volume mounted with 4 15000rpm SAS drives.
> > Unfortunately, the maximum speed we are acheiving is 94 MB/s. We do
> > know that the network interfaces can stream data at 822MB/s (results
> > obtained with netperf). we know that local read performance on the
> > disks is 480MB/s. When using netcat or direct tcp/ip connection we get
> > speeds in this range, however when we connect a volume via the iscsi
> > protocol using the open-iscsi initiator we drop to 94MB/s(best result.
> > Obtained with bonnie++ and dd).
> What block size are you using with dd?
> Try: dd if=/dev/foo of=/dev/null bs=1024k count=32768
> How's the CPU usage on both the target and the initiator when you run
> that? Is there iowait?
> Did you try with nullio LUN from the target?
> -- Pasi


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