Messages in this thread | | | Date | Wed, 16 Jul 2008 07:38:02 +0200 | From | Eric Dumazet <> | Subject | Re: sendfile() broken with 2.6.26 + Apache 2 ? |
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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)
If you disable TCP segmentation offload on this NIC (ethtool -K eth0 tso off) , is this problem still present ?
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