Messages in this thread |  | | Date | Mon, 09 Sep 2002 17:58:21 +0900 (JST) | Subject | Re: [PATCH] zerocopy NFS for 2.5.33 | From | Hirokazu Takahashi <> |
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Hi,
As far as I know e1000 has a feature that it can split a jumbo UDP frame into some IP fragments.
> From: Hirokazu Takahashi <taka@valinux.co.jp> > Date: Mon, 09 Sep 2002 16:11:23 +0900 (JST) > > Using TSO code is commented out at this moment as TSO for UDP isn't > implemented yet. I'm waiting for it so that we would remove "#ifdef NotYet" > to send jumbo UDP frames without any fragmentation and any checksumming. > Then I hope we will get great performance. > > Actually, device interface for what could be used is there, see > NETIF_F_FRAGLIST. No devices set this and IP never makes use of it > yet though :-) > > Acenic and Tigon3 will be able to do this, probably e1000 has this > feature as well. > > But it does not work how you imagine. One passes already fragmented > list of packets to card, and it can checksum the packet if you tell it > which descriptor is first of fragmented frame and which is last. > > It does not do the fragmentation of UDP frames for you, only > checksumming of UDP portion. No card does what you mention. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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