Re: sendfile() broken with 2.6.26 + Apache 2 ?

[J. K. Cliburn]

Eric Dumazet wrote:
> 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.

> > > 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...

I'm currently traveling and unable to delve into this issue and its 
relation to the atl1 driver.  I should be able to look at it this 
weekend when I get back home.

Jay
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