From mboxrd@z Thu Jan 1 00:00:00 1970 From: Evgeniy Polyakov Subject: Re: problems with e1000 and jumboframes Date: Fri, 4 Aug 2006 09:58:53 +0400 Message-ID: <20060804055853.GA413@2ka.mipt.ru> References: <20060803135925.GA28348@2ka.mipt.ru> <20060803.225501.77357103.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=koi8-r Cc: herbert@gondor.apana.org.au, arnd@arndnet.de, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Return-path: Received: from relay.2ka.mipt.ru ([194.85.82.65]:41941 "EHLO 2ka.mipt.ru") by vger.kernel.org with ESMTP id S1161061AbWHDF7c (ORCPT ); Fri, 4 Aug 2006 01:59:32 -0400 To: David Miller Content-Disposition: inline In-Reply-To: <20060803.225501.77357103.davem@davemloft.net> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Thu, Aug 03, 2006 at 10:55:01PM -0700, David Miller (davem@davemloft.net) wrote: > From: Herbert Xu > Date: Fri, 04 Aug 2006 15:52:40 +1000 > > > Evgeniy Polyakov wrote: > > > > > > But it does not support splitting them into page sized chunks, so it > > > requires the whole jumbo frame allocation in one contiguous chunk, 9k > > > will be transferred into 16k allocation (order 3), since SLAB uses > > > power-of-2 allocation. > > > > Actually order 3 is 32KB. Yep, e1000 align 9k to 16k, then alloc_skb adds shared info and align it to 32k. > It's 64KB on my computer :) Nice overhead... -- Evgeniy Polyakov