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Date: Wed, 30 Dec 2009 11:37:13 +0100 From: Ben Hutchings <bhutchings@...arflare.com> To: thomas yang <lampsu@...il.com> Cc: netdev@...r.kernel.org Subject: Re: Ethernet CRC questions On Wed, 2009-12-30 at 13:53 +0800, thomas yang wrote: > 2009/12/30 Ben Hutchings <bhutchings@...arflare.com>: > > On Wed, 2009-12-30 at 01:17 +0800, thomas yang wrote: > >> How does Linux generate Ethernet CRC ? > >> by the hardware (Ethernet controller) or use crc32_le() / > >> crc32_be() ( lib/crc32.c ) ? > >> > >> P.S. my network card is rtl8139d , use 8139too driver > > > > The Ethernet frame CRC is normally generated and verified in hardware. > > These library functions are needed for the few MACs that don't, or where > > the same CRC function is used for some other purpose (e.g. as a hash > > function for multicast filtering). > > > > Does the Ethernet frame CRC (generate and verify in hardware) make > the TX / RX rate a little smaller , and a longer end-to-end delay ? Relative to what? > Could I disable CRC appending / verifying in the network card driver > on all of my nodes (machines) ? Maybe if you want switches to discard everything you send... Ben. -- Ben Hutchings, Senior Software Engineer, Solarflare Communications Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. -- 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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