Date: Sun, 16 May 2010 23:47:08 +0200 From: Nicolas Morey-Chaisemartin <devel@morey-chaisemartin.com> To: freebsd-scsi@freebsd.org Subject: Read performance problem with iSCSI Message-ID: <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 mistaken. 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 have enough tags but increasing the value did not really help. All the other tips i could find were about fine tuning and nothing to gain a factor of 6 or 7... Has any one see this problem or can someone point me in a direction to look 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.store 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 stat=b57b itt=b57b net.iscsi_initiator.0.douio: 0 net.iscsi_initiator.0.pid: 1608
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