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Date: Wed, 16 Jul 2008 08:30:16 +0100 From: Ian Jeffray <ian@...fray.co.uk> To: Eric Dumazet <dada1@...mosbay.com> CC: linux-kernel@...r.kernel.org, Linux Netdev List <netdev@...r.kernel.org> Subject: Re: sendfile() broken with 2.6.26 + Apache 2 ? 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? Ian. -- 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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