netdev - Re: Ethernet CRC questions

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Date:	Wed, 30 Dec 2009 13:53:09 +0800
From:	thomas yang <lampsu@...il.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Ethernet CRC questions

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 ?
 Could I disable CRC appending / verifying  in the network card driver
  on all of my nodes (machines) ?

Thanks.



--
Thomas
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