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, >=20 > I am not sure if this is the right place, some my apologies if I'm mist= ak=3Den. > I have a FreeBSD 8.0 stable running on an amd64 machine (with the last = 2.=3D2.4 iscsi tarball from http://www.cs.huji.ac.il/=7Edanny/ftp/freebsd= /).=20 > It is connected to a Thecus N5500 pro using iSCSI. >=20 > I've configured using the tutorial all over Google and it works =21 > Using dd, I get 52MB/s write speed which is a bit lower than expected b= ut=3D still allright. However reading is deadly slow.> At best, I reached= something like 8MB/s which is unacceptable. >=20 > After looking through Google and old mailing list mails, I made sure I = ha=3Dve enough tags but increasing the value did not really help.> All th= e other tips i could find were about fine tuning and nothing to gai=3Dn a= factor of 6 or 7... >=20 > Has any one see this problem or can someone point me in a direction to = lo=3Dok for? >=20 > One weird thing I noticed while playing with camcontrol is I get an err= or=3D on access rate. > Sun=23 camcontrol inquiry da0 > pass0: <NAS iSCSI-VDISK 0> Fixed Direct Access SCSI-4 device=20 > pass0: Serial Number =20 > camcontrol: error getting transfer settings >=20 >=20 > Thanks in advance >=20 > Nicolas >=20 >=20 > Here's my config (feel free to ask for more info): > Sun=23 cat /etc/iscsi.conf=20 > stephano =7B > authmethod =3D None > TargetName =3D iqn.2010-5.com.****:RAID.iscsi0.vg0.store > TargetAddress =3D 10.0.2.55:3260,1 > tags =3D 64> =7D >=20 > Sun=23 sysctl net.iscsi_initiator > net.iscsi_initiator.driver_version: 2.2.4 > net.iscsi_initiator.isid: =80DIB00> net.iscsi_initiator.sessions: 1 > net.iscsi_initiator.0.targetname: iqn.2010-5.com****:RAID.iscsi0.vg0.st= or=3De > net.iscsi_initiator.0.targeaddress: 10.0.2.55 > net.iscsi_initiator.0.stats: recv=3D46460 sent=3D46460 flags=3D0x000003= 9f=3D pdus-alloc=3D0 pdus-max=3D5 cws=3D33 cmd=3Db57b exp=3Db57b max=3Db5= 9b st=3Dat=3Db57b itt=3Db57b> 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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