Messages in this thread | | | Subject | Re: RFC: MTU for serving NFS on Infiniband | From | Ben Hutchings <> | Date | Tue, 24 Aug 2010 18:57:27 +0100 |
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On Tue, 2010-08-24 at 09:14 -0600, Marc Aurele La France wrote: > On Mon, 23 Aug 2010, Stephen Hemminger wrote: > > On Mon, 23 Aug 2010 08:44:37 -0600 (MDT) > > Marc Aurele La France <tsi@ualberta.ca> wrote: > >> In regrouping for my next tack at this, I noticed that all stack traces go > >> through ip_append_data(). This would be ipv6_append_data() in the IPv6 case. > >> A _very_ rough draft that would have ip_append_data() temporarily drop down > >> to a smaller fake MTU follows ... > > > Why doesn't NFS generate page size fragments? Does Infiniband or your > > device not support this? Any thing that requires higher order allocation > > is going to unstable under load. Let's fix the cause not the apply bandaid > > solution to the symptom. > > From what I can tell, IP fragmentation is done centrally. [...]
Stephen and I are not talking about IP fragmentation, but about the ability to append 'fragments' to an skb rather than putting the entire packet payload in a linear buffer. See <http://vger.kernel.org/~davem/skb_data.html>.
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.
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