Date: Fri, 22 Jan 2010 14:55:30 +1100 From: Andrew Snow <andrew@modulus.org> To: Miroslav Lachman <000.fbsd@quip.cz>, freebsd-scsi@freebsd.org Subject: Re: performance tuning of iSCSI and Dell MD3000i Message-ID: <4B5921B2.1030906@modulus.org> In-Reply-To: <4B5907E2.2060206@quip.cz> References: <4B57263E.7040809@quip.cz> <E1NXs1v-0008L0-Nx@kabab.cs.huji.ac.il> <4B5907E2.2060206@quip.cz>
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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. - Andrew
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