Date: Sun, 18 Nov 2007 16:04:14 -0800 From: "Jack Vogel" <jfvogel@gmail.com> To: pyunyh@gmail.com Cc: Mike Silbersack <silby@freebsd.org>, Andre Oppermann <andre@freebsd.org>, Kip Macy <kip.macy@gmail.com>, Denis Shaposhnikov <dsh@vlink.ru>, freebsd-current@freebsd.org, Mike Andrews <mandrews@bit0.com> Subject: Re: bizarre em + TSO + MSS issue in RELENG_7 Message-ID: <2a41acea0711181604p7a58df5chdae6a98f915dcb99@mail.gmail.com> In-Reply-To: <20071118054409.GA1044@cdnetworks.co.kr> References: <20071117003504.R31357@mindcrime.int.bit0.com> <b1fa29170711171308x62a6371dnbb939748c5c59ae2@mail.gmail.com> <20071117170537.F59492@mindcrime.int.bit0.com> <b1fa29170711171519r65473426s1b9f3d9666ff6a92@mail.gmail.com> <20071117182232.T59492@mindcrime.int.bit0.com> <b1fa29170711171619x24233a3cw4361e0f3ca395e4c@mail.gmail.com> <473F9552.50402@bit0.com> <b1fa29170711171804x36e4ae51ie03d01e4bc0220ac@mail.gmail.com> <473FBD1A.8010207@bit0.com> <20071118054409.GA1044@cdnetworks.co.kr>
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On Nov 17, 2007 9:44 PM, Pyun YongHyeon <pyunyh@gmail.com> wrote: > > It seems that em(4) uses EM_TSO_SIZE(64K) to create DMA tag. A packet > can have 64K payload under TSO so its the mximum size of the mbuf > chain would be 64K + sizeof(link layer). So I guess the EM_TSO_SIZE > should be increased to hold sizeof(link layer). > It had been a long time since I looked into em(4) so I'm not sure. Hmm, you are right about this Pyun, I think this should be fixed, although I do not see how that would effect this since Mike's payloads are always way under this. Still I'll keep this in mind to be changed. Thanks for pointing it out. Jack
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