Re: [Scst-devel] bad performance with 10G network

[Bart V. A. <bva...@ac...>]

On Tue, Jan 31, 2012 at 5:23 PM, Xianghua Xiao <xia...@gm...>wrote:

> I used the newest 2.2.x release with kernel 3.0.6 on powerpc,
> blockio/iscsi-target.
>
> For local RAID5/SSD-array I have 400MB/s for READ, 280MB/s for WRITE.
> For local RAID0/SSD-array I have 400MB/s for READ, 400MB/s for WRITE.
>
> I used netperf/iperf to check network, it's running 6+Gbps with jumbo
> size of 7200Byte(I can not use 9600 jumbo), not bad. This is a
> point-to-point link.
>
> I then used open-iscsi as the initiator, it give me:
> RAID5 R/W: 280MB/s , 90MB/s
> RAID0 R/W: 300MB/s, 180MB/s
>

Did you perhaps forget to apply the put_page_callback patch ? As you can
see in this thread, some time ago I measured
a bandwidth of more than 600 MB/s with iSCSI-SCST and IPoIB over a DDR IB
network:
http://groups.google.com/group/open-iscsi/browse_thread/thread/07f71acbdf08339d?pli=1
.

Bart.