Date: Fri, 2 Feb 2001 00:50:18 +0000 From: Tony Finch <dot@dotat.at> To: David Xu <davidx@viasoft.com.cn> Cc: Kris Kennaway <kris@obsecurity.org>, bsddiy <bsddiy@163.net>, freebsd-net@FreeBSD.ORG Subject: Re: sendfile() Message-ID: <20010202005018.Y70673@hand.dotat.at> In-Reply-To: <001d01c08cb1$9c445d80$6201a8c0@William> References: <1217774688.20010201133139@163.net> <20010201023825.A71975@xor.obsecurity.org> <20010201180010.Q70673@hand.dotat.at> <001d01c08cb1$9c445d80$6201a8c0@William>
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David Xu <davidx@viasoft.com.cn> wrote: > >but as I know, it seems TCP_NOPUSH is mainly used for TTCP, right? That's what it was designed for. >the idea behind TCP_CORK is it buffers any small data segment user >program sending until these segments full fills a max TCP packet, >then the packet is sent, TCP_NOPUSH is the same >web servers always send many very small HTTP headers, cause lots of >small packets sent out, TCP_CORK can increase network performance. No, web servers are very careful to reduce the number of packets required for a response. TCP_CORK exists to avoid two bad packet boundaries per request: one between the header and the body, and one between the body and the next response. FreeBSD's sendfile allows you to easily optimise the beginning of the response; optimising the transition from one response to the next is harder. Tony. -- f.a.n.finch fanf@covalent.net dot@dotat.at "If I didn't see it with my own eyes I would never have believed it!" To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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