The dd command I am running is time dd if=/dev/zero bs=1024k of=/mnt/ iscsi/10gfile.txt count=10240 My fs is xfs (mkfs.xfs -d agcount=8 -l internal,size=128m -n size=8k - i size=2048 /dev/sdb1 -f) those are the parameters used to format the drive.
Here are the top values: Cpu(s): 0.0%us, 6.1%sy, 0.0%ni, 25.0%id, 67.2%wa, 0.1%hi, 1.7%si, 0.0%st I have not tried nullio LUN from target. I'm not sure how to go about it actually... Thanks for your help ! On Nov 25, 5:04 am, Pasi Kärkkäinen <[email protected]> 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 -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/open-iscsi?hl=en.
