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Date: Wed, 16 Jul 2008 11:08:04 +0200 From: Eric Dumazet <dada1@...mosbay.com> To: Ian Jeffray <ian@...fray.co.uk> Cc: linux-kernel@...r.kernel.org, Linux Netdev List <netdev@...r.kernel.org>, jacliburn@...lsouth.net, csnook@...hat.com, jeff@...zik.org Subject: Re: sendfile() broken with 2.6.26 + Apache 2 ? Ian Jeffray a écrit : > Hi Eric, > > Thanks for directing me to a better list. > > Further responses below: > > Eric Dumazet wrote: >> CC to netdev where this report might find better answers >> >> Ian Jeffray a écrit : >>> All, >>> >>> I moved from kernel 2.6.25.4 to 2.6.26 yesterday and observed that >>> large files sent via Apache2 are partially corrupt. >>> >>> This appears to be linked to sendfile() -- disabling the use of >>> sendfile in the apache config (EnableSendfile Off) allows it to >>> function as normal. >>> >>> My system is a simple Core2Duo running Debian lenny/sid; nothing >>> special, and I have never observed problems like this before. >>> >>> The problem feels certainly related to sendfile() since the data >>> reads correctly from disc in other programs, and via CIFS etc. >>> >>> The corruption happens part-way in to the file... I've no exact >>> figure but it would seem like maybe 32KB -- I'm seeing broken >>> PNGs served from Apache, where the top few dozen lines decode >>> correctly, and the rest is garbage. >>> >>> I've made basically no configuration changes between 2.6.25.4 and >>> 2.6.26 and have explicitly tried both enabling and disabling the >>> new PAT support to no effect. >>> >>> This is completely repeatable and reproducible. >>> >>> Is anyone else seeing this broken behaviour? >>> >> >> >> What kind of network adapter are you using ? (lspci | grep -i ether) > > 02:00.0 Ethernet controller: Attansic Technology Corp. L1 Gigabit > Ethernet Adapter (rev b0) > > >> If you disable TCP segmentation offload on this NIC (ethtool -K eth0 >> tso off) , is this problem still present ? > > Wow. That 'solves' the problem! Great. > > Does this therefore point to an attansic driver issue? > Yes, maybe related to commit 9d90fb1ac9d97da86e24d9ea947bf2a2f333829a In this patch, Jay Cliburn enabled TSO by default for atl1 driver. This might be a driver problem, or a generic sendfile() problem, I dont know... -- 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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