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Date: Thu, 21 Aug 2008 16:31:14 -0400 From: Chris Snook <csnook@...hat.com> To: Hua Zhong <hzhong@...il.com> CC: netdev@...r.kernel.org Subject: Re: tcp write returns 0? Hua Zhong wrote: > Under what condition would tcp write return 0? > > Especially since a previous poll() indicates the socket is writable. Could > this only happen for socket in NONBLOCK mode? The socket could become unwritable for various reasons between poll() returning and the send() call. This shouldn't happen very often, but if the system is under memory pressure and needs to page in data between those two calls, that race window can get rather large. You might want to increase your TCP buffer sizes, either per-socket with setsockopt, or system-wide with sysctl. -- Chris -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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