Re: iSCSI throughput drops as link rtt increases?

2010-01-07 Thread Jack Z
Hi Pasi, Thank you very much for your help. I really appreciate it! On Jan 5, 12:58 pm, Pasi Kärkkäinen pa...@iki.fi wrote: On Tue, Jan 05, 2010 at 02:05:03AM -0800, Jack Z wrote: Try using some benchmarking tool that can do multiple outstanding IOs.. for example ltp disktest. And I

Re: iSCSI throughput drops as link rtt increases?

2010-01-07 Thread Ulrich Windl
On 4 Jan 2010 at 6:54, Jack Z wrote: Hi all, I was testing the performance of open-iscsi initiator with IET target over a 100Mbps Ethernet link with emulated rtt. What I did was to do raw disk sequential write by $ dd if=/dev/zero of=/dev/sdb bs=1024 count=1048576 , in which /dev/sdb

Re: iSCSI throughput drops as link rtt increases?

2010-01-07 Thread Pasi Kärkkäinen
On Wed, Jan 06, 2010 at 11:59:37PM -0800, Jack Z wrote: Hi Pasi, Thank you very much for your help. I really appreciate it! On Jan 5, 12:58 pm, Pasi Kärkkäinen pa...@iki.fi wrote: On Tue, Jan 05, 2010 at 02:05:03AM -0800, Jack Z wrote: Try using some benchmarking tool that can do

Re: [PATCH] support NIC configuration in iBFT

2010-01-07 Thread Alex Zeffertt
Mike Christie wrote: Thanks for doing this. Sorry for the late reply. Just one comment on the patch. Could you move the code in the 'n' case + case 'n': + /* +* Bring up NICs required by targets in iBFT +*

Re: [PATCH] support NIC configuration in iBFT

2010-01-07 Thread Ulrich Windl
On getopt: I always prefer to list options in an ordered way (alphabetically). - while ((ch = getopt_long(argc, argv, i:t:g:a:p:d:u:w:U:W:bfvh, + while ((ch = getopt_long(argc, argv, i:t:g:a:p:d:u:w:U:W:bnfvh, On 7 Jan 2010 at 14:16, Alex Zeffertt wrote: Mike Christie wrote:

Re: iSCSI throughput drops as link rtt increases?

2010-01-07 Thread Jack Z
Hi Ulrich, Thanks for your reply! I was testing the performance of open-iscsi initiator with IET target over a 100Mbps Ethernet link with emulated rtt.  What I did was to do raw disk sequential write by $ dd if=/dev/zero of=/dev/sdb bs=1024 count=1048576 , in which /dev/sdb is the