Date: Mon, 17 May 2010 09:42:11 +0300 From: Daniel Braniss <danny@cs.huji.ac.il> To: devel@morey-chaisemartin.com Cc: freebsd-scsi@freebsd.org Subject: Re: Read performance problem with iSCSI Message-ID: <E1ODu1j-000Kke-Oe@kabab.cs.huji.ac.il> In-Reply-To: <4BF067DC.4030402@morey-chaisemartin.com> References: <4BF067DC.4030402@morey-chaisemartin.com>
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> Hi, > > I am not sure if this is the right place, some my apologies if I'm mistak=en. > I have a FreeBSD 8.0 stable running on an amd64 machine (with the last 2.=2.4 iscsi tarball from http://www.cs.huji.ac.il/~danny/ftp/freebsd/). > It is connected to a Thecus N5500 pro using iSCSI. > > I've configured using the tutorial all over Google and it works ! > Using dd, I get 52MB/s write speed which is a bit lower than expected but= still allright. However reading is deadly slow.> At best, I reached something like 8MB/s which is unacceptable. > > After looking through Google and old mailing list mails, I made sure I ha=ve enough tags but increasing the value did not really help.> All the other tips i could find were about fine tuning and nothing to gai=n a factor of 6 or 7... > > Has any one see this problem or can someone point me in a direction to lo=ok for? > > One weird thing I noticed while playing with camcontrol is I get an error= on access rate. > Sun# camcontrol inquiry da0 > pass0: <NAS iSCSI-VDISK 0> Fixed Direct Access SCSI-4 device > pass0: Serial Number > camcontrol: error getting transfer settings > > > Thanks in advance > > Nicolas > > > Here's my config (feel free to ask for more info): > Sun# cat /etc/iscsi.conf > stephano { > authmethod = None > TargetName = iqn.2010-5.com.****:RAID.iscsi0.vg0.store > TargetAddress = 10.0.2.55:3260,1 > tags = 64> } > > Sun# sysctl net.iscsi_initiator > net.iscsi_initiator.driver_version: 2.2.4 > net.iscsi_initiator.isid: €DIB00> net.iscsi_initiator.sessions: 1 > net.iscsi_initiator.0.targetname: iqn.2010-5.com****:RAID.iscsi0.vg0.stor=e > net.iscsi_initiator.0.targeaddress: 10.0.2.55 > net.iscsi_initiator.0.stats: recv=46460 sent=46460 flags=0x0000039f= pdus-alloc=0 pdus-max=5 cws=33 cmd=b57b exp=b57b max=b59b st=at=b57b itt=b57b> net.iscsi_initiator.0.douio: 0 > net.iscsi_initiator.0.pid: 1608 hi Nicolas, have you tried increasing net.inet.tcp.recvspace net.inet.tcp.sendspace also what is the target? danny
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