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Date: Wed, 05 Oct 2011 08:53:47 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: starlight@...nacle.cx Cc: linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>, Willy Tarreau <w@....eu>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Stephen Hemminger <stephen.hemminger@...tta.com> Subject: Re: big picture UDP/IP performance question re 2.6.18 -> 2.6.32 Le lundi 03 octobre 2011 à 14:02 -0400, starlight@...nacle.cx a écrit : > At 06:16 PM 10/3/2011 +0200, Eric Dumazet wrote: > > > >It seems you use 4096 2MB hugepages, and your > >machine has 1GB pages availabe, you could > >try to use them. > > > >(boot cmd : hugepagesz=1GB hugepages=8 ) > > Tried it and got errno 12 on the segment > allocations. None were allocated, though > the count is six and the largest is exactly > 1GB. Don't have time to dig into it. > Thats pretty normal ;) With 2MB pages, your segment size must be a 2MB multiple. With 1GB pages, your segment size must be a .... 1GB multiple. So only applicable is say you handle one big 8GB segment for example, or 2 4GB segments... Well you see the picture. -- 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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