Date: Fri, 28 Jul 2000 23:43:09 +0200 From: sthaug@nethelp.no To: archie@whistle.com Cc: silby@silby.com, freebsd-net@FreeBSD.ORG, jlemon@FreeBSD.ORG Subject: Re: sub-optimal tcp_ouput() performance in the face of ENOBUFS Message-ID: <20394.964820589@verdi.nethelp.no> In-Reply-To: Your message of "Fri, 28 Jul 2000 14:34:48 -0700 (PDT)" References: <200007282134.OAA27448@bubba.whistle.com>
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> I understand the scenario described by the commit message. What > I don't understand about this commit is this: suppose the exact > same scenario happens, except that instead of ip_output() returning > ENOBUFS, it returns zero, BUT the packet is dropped anyway because > of (say) an Ethernet collision. A normal Ethernet collision does *not* result in a dropped packet - simply a packet which is transmitted a few microseconds later by the Ethernet hardware. If the packet has not been successfully transmitted in 16 attempts, it is indeed dropped - but this is (or should be!) an extremely rare event. Steinar Haug, Nethelp consulting, sthaug@nethelp.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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