From mboxrd@z Thu Jan 1 00:00:00 1970 From: "David S. Miller" Subject: Re: [Ksummit-2005-discuss] Summary of 2005 Kernel Summit Proposed Topics Date: Sun, 27 Mar 2005 10:31:15 -0800 Message-ID: <20050327103115.5c746472.davem@davemloft.net> References: <4241D106.8050302@cs.wisc.edu> <20050324101622S.fujita.tomonori@lab.ntt.co.jp> <1111628393.1548.307.camel@beastie> <20050324113312W.fujita.tomonori@lab.ntt.co.jp> <1111633846.1548.318.camel@beastie> <20050324215922.GT14202@opteron.random> <424346FE.20704@cs.wisc.edu> <20050324233921.GZ14202@opteron.random> <20050325034341.GV32638@waste.org> <20050327035149.GD4053@g5.random> <20050327054831.GA15453@waste.org> <1111905181.4753.15.camel@mylaptop> <20050326224621.61f6d917.davem@davemloft.net> <1111907130.4753.32.camel@mylaptop> <20050326235712.25f9ca36.davem@davemloft.net> <1111911493.5824.12.camel@mylaptop> <4246FAD5.5080700@cs.wisc.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: open-iscsi@googlegroups.com, mpm@selenic.com, andrea@suse.de, James.Bottomley@HansenPartnership.com, ksummit-2005-discuss@thunk.org, netdev@oss.sgi.com To: Mike Christie In-Reply-To: <4246FAD5.5080700@cs.wisc.edu> Sender: netdev-bounce@oss.sgi.com Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org On Sun, 27 Mar 2005 10:26:29 -0800 Mike Christie wrote: > reliable receive is ciritical for WRITEs. Even if the WRITE is executed > successfully on the remote device, if we cannot receive the return status > from the device the operation will fail at the iscsi driver side due to a > SCSI timeout. I keep hearing this word "reliable", it means something very different for TCP over a transport like IP than it does for the SCSI layer. It is, in fact, the whole difficulty of implementing iSCSI: being able to cope with this difference in expectations. All I can see is that the SCSI layer's timeout is inappropriate for something like iSCSI, not that TCP or networking needs to change in some way.