Date: Sat, 11 Jul 2009 12:41:48 +0800 From: Jiansong Liu <jiansong.liu@gmail.com> To: Gary Palmer <gpalmer@freebsd.org> Cc: freebsd-scsi@freebsd.org Subject: Re: iscsi_initiator 2.2.2 slow to write and read Message-ID: <7f834c1c0907102141n5d55f786keb55f44126cd94c2@mail.gmail.com> In-Reply-To: <20090707173629.GA33007@in-addr.com> References: <7f834c1c0907070405mdab72u3223d90b84b2a201@mail.gmail.com> <20090707173629.GA33007@in-addr.com>
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On Wed, Jul 8, 2009 at 1:36 AM, Gary Palmer <gpalmer@freebsd.org> wrote:
> On Tue, Jul 07, 2009 at 07:05:03PM +0800, Jiansong Liu wrote:
> > Hello All,
> >
> > I downloaded the latest iscsi_initiator 2.2.2 from Danny's FTP,
> > and compile kernel and iscontrol with 7.2 STABLE GENERIC config, only got
> > about 800KB/Sec speed to a DELL MD3000i disk array, I searched in
> > this malling list and found a patch, but it seems is not for this version
> > (2.2.2), any advice would be great appreciated.
> >
> > here are some details about my system:
> >
> > # sysctl net.iscsi
> > net.iscsi.driver_version: 2.2.2
> > net.iscsi.isid: ???DIB00
> > net.iscsi.sessions: 1
> > net.iscsi.0.targetname:
> > iqn.1984-05.com.dell:powervault.md3000i.60024e80004e71a9000000004a011120
> > net.iscsi.0.targeaddress: 192.168.4.182
> > net.iscsi.0.stats: recv=594 sent=594 flags=0x0000039f pdus-alloc=16
> > pdus-max=16 cws=426 cmd=157 exp=157 max=300 stat=159 itt=157
> > net.iscsi.0.douio: 0
> > net.iscsi.0.pid: 754
> >
> > # cat /etc/iscsi.conf
> > scpstorage01 {
> > initiatorname =iqn.2005-01.il.ac.huji.cs::static01.com
> > TargetName
> >
> =iqn.1984-05.com.dell:powervault.md3000i.60024e80004e71a9000000004a011120
> > TargetAddress =192.168.4.182:3260,1
> > tags =4
> > }
>
> I'm no expert, but if that "tags" line refers to SCSI tags then that
> number is too small. Try increasing it and see if that helps to
> address the problem.
>
> Regards,
>
> Gary
>
Hi Gary,
Thanks for the advice, I have tried set tags to 32 and 64,
but it could not get more performance on IO (90MB write and 56MB read).
I think the writing is good enough for my application, but the reading still
is a problem.
# dd if=/home/mogdata/test.foo of=/dev/null
2048000+0 records in
2048000+0 records out
1048576000 bytes transferred in 17.670549 secs (59340318 bytes/sec)
Best regards,
Liu Jiansong
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