Boaz Harrosh wrote:
> On 11/24/2009 06:07 PM, 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.
> That is the iscsi-target machine, right?
> What is the SW environment of the initiator box?
>> 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 iscsi target are you using?
> Mike, is it still best to use no-op-io-scheduler on initiator?


Chris, try doing

echo noop > /sys/block/sdXYZ/queue/scheduler

Then rerun your tests.

For your tests you might want something that can do more IO. If you can 
could try disktest or fio or even do multiple dds at the same time.

Also what is the output of

iscsiadm -m session -P 3


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