Date: Fri, 22 Jan 2010 12:12:44 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> To: Andrew Snow <andrew@modulus.org> Cc: freebsd-scsi@freebsd.org Subject: Re: performance tuning of iSCSI and Dell MD3000i Message-ID: <4B59882C.7030506@quip.cz> In-Reply-To: <4B5921B2.1030906@modulus.org> References: <4B57263E.7040809@quip.cz> <E1NXs1v-0008L0-Nx@kabab.cs.huji.ac.il> <4B5907E2.2060206@quip.cz> <4B5921B2.1030906@modulus.org>
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Andrew Snow wrote: > > Hi Miroslav, > > have you tried increasing your TCP/IP Window settings at both ends? > > In freebsd sysctl.conf: > > kern.ipc.maxsockbuf=1048576 > net.inet.tcp.recvspace=262144 > net.inet.tcp.sendspace=262144 > > > I never had trouble hitting line rate of 1Gbps iSCSI with freebsd, but > the biggest problem was not speed but what happens if the device times > out or drops out, it causes FreeBSD to completely crash instead of > degrading gracefully. My current settings is: kern.ipc.maxsockbuf: 262144 net.inet.tcp.recvspace: 65536 net.inet.tcp.sendspace: 32768 net.inet.tcp.recvbuf_max: 262144 net.inet.tcp.recvbuf_inc: 16384 net.inet.tcp.recvbuf_auto: 1 net.inet.tcp.sendbuf_max: 262144 net.inet.tcp.sendbuf_inc: 8192 net.inet.tcp.sendbuf_auto: 1 I will try your recommended values and post results later this day. (but I don't know how can I change it on MD3000i side) Thank you for your reply Miroslav Lachman
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