Date: Tue, 14 Jun 2016 17:08:42 +0200 From: Dominik Schoeffmann <schoeffm@in.tum.de> To: net@freebsd.org Subject: Netmap Checksum Offloading Message-ID: <57601DFA.2040008@in.tum.de>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --c2ilmUOL4VmDEpGuPjGWmDn46sh7vDw5d Content-Type: multipart/mixed; boundary="ojWM2RfT27D5rxalIH6m7sQf9oPQ8T9jk" From: Dominik Schoeffmann <schoeffm@in.tum.de> To: net@freebsd.org Message-ID: <57601DFA.2040008@in.tum.de> Subject: Netmap Checksum Offloading --ojWM2RfT27D5rxalIH6m7sQf9oPQ8T9jk Content-Type: multipart/mixed; boundary="------------070703060403080105060100" This is a multi-part message in MIME format. --------------070703060403080105060100 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Dear Netmap Developers, during the course of my bachelor's thesis, I modified a packet generator called MoonGen [1] in order to utilize netmap. One key component was to flexibly offload checksums for different kinds of packets (IPv4, UDP, TCP). The ixgbe netmap patch was modified [2] in order to construct context descriptors and suitable data descriptors. This is implemented in less than 250 LoC (including pseudo-header calculations). The man page states, that checksum offloading is available via ethtool, although a solution inside the netmap API might be a cleaner way for applications to actually use these features. Attached is a graph showing the performance implication of using offloading in the current implementation. As can be seen, offloading has only a minor impact. When regarding this data (and comparing it to other frameworks), please keep in mind, that internally a lot of per-packet effort is needed due to the software architecture of the packet generator. The question being: Would it not make sense to include checksum offloading inside of netmap in order to accomodate applications operating on layer 3 and above? As these programs need to calculate the checksums in software, it would be just as fast to move these calculations to the kernel for NICs without checksum offloading support (and the kernel would act as a librar= y). The problem which currently is imposed by the fact, that netmap exports the complete ring, is that context descriptors disrupt the data descriptors, which is unpleasant for the application. But you may find the data interesting nevertheless. Best Regards, Dominik Schoeffmann [1] https://github.com/dschoeffm/MoonGen/tree/netmap [2] https://github.com/dschoeffm/netmap/tree/mg-chksum-offloading --------------070703060403080105060100 Content-Type: application/pdf; name="netmap-offloading.pdf" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="netmap-offloading.pdf" JVBERi0xLjUKJbXtrvsKMyAwIG9iago8PCAvTGVuZ3RoIDQgMCBSCiAgIC9GaWx0ZXIgL0Zs YXRlRGVjb2RlCj4+CnN0cmVhbQp4nJWbyY4ktxGG73yKOlbB6FRyTfI6kGFYgAHLHsOHgQ5C abM8I1mSN/jpHcFYWV2t6YIh90R08CeDZJIfmdk/hX07ytjT6fbnn353+uTL/fTtLxCRR6+n /4T99Bn893149wVE7aevQtxPfzi1tB0tnVLfWoqnD2rXuNXeTu9P49hG7hYgtgbEnLcYc7AQ 9viY1rcErbAQcWhI2vNWWuSQADHqsZgMv8yHyajDQo689X1oSDCPxuS9b6MXk1GHhZSyxeYi ph1cxJ9DLluLrjH5SFsu2lUoMgNq23JuLoAdEhBOvWx79RLsUIkY43YcLoAdFpDHVnoJPoRc LqYdG/SpD2GPhYyyjdix2zSGXRqTUoI+9zLisZAKs64mCwnqwo7bt7rHASP7/B8wb/ctjpFw xr4wN3Pa+oGdczNXbfKWAzo46eQNz2avStzMZpveKqGTWeeleFTkdr67J8Bkbp6AoB6TuXkm 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