Date: Fri, 14 Mar 2008 21:27:08 +0900 From: Pyun YongHyeon <pyunyh@gmail.com> To: Giulio Ferro <auryn@zirakzigil.org> Cc: Andrew Thompson <thompsa@freebsd.org>, freebsd-net@freebsd.org Subject: Re: VLAN trunking and fragmentation Message-ID: <20080314122708.GG22788@cdnetworks.co.kr> In-Reply-To: <47DA682E.9010504@zirakzigil.org> References: <47D7C34E.8060805@zirakzigil.org> <47D817D2.9010306@errno.com> <47D8499A.5070605@zirakzigil.org> <20080313033029.GF16972@cdnetworks.co.kr> <47D92F9D.4070701@zirakzigil.org> <20080314001704.GA22788@cdnetworks.co.kr> <47DA4DCD.6050304@zirakzigil.org> <20080314101555.GF22788@cdnetworks.co.kr> <47DA682E.9010504@zirakzigil.org>
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On Fri, Mar 14, 2008 at 12:57:34PM +0100, Giulio Ferro wrote: > Pyun YongHyeon wrote: > > > No packet reached the other PC. > > > >Ok, then try disabling hardware VLAN tagging. > >(#ifconfig re0 -vlanhwtag) > > > > > That's it! > Now seems to work properly, the problem then is with hardware tagging. > > My question now is: can I use vlans without htag in a complex system with > heavy traffic without a significant performance loss? If not, how much Using available hardware assitance is almost always better than software approach. Disabling VLAN hardware assistance also disables checksum offload on VLAN interface so it may hurt VLAN performance a lot. > will it > take to fix the issue with the driver? > This hardware really make me crazy. There had been many attempts to fix checksum offload related issues. But it seems that several users still suffer from bad checksum or VLAN issues. So I guess the root cause of hardware bug was not yet known. This means that previous patch to work around hardware bug is not complete. Hmm, I'm not sure but it could be related with padding. What makes me wonder is why the first packet of fragmented packet does not show up on destination host. I guess the second packet of fragmented packet may be composed of single mbuf. From these information I will experiment possible combination of work around in next week. I'll let you know when I have a code. > Thanks for your answer. > -- Regards, Pyun YongHyeon
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