Re: 2.6.25-rc8: FTP transfer errors

[Jeff Garzik]

Mark Lord wrote:
> Mark Lord wrote:
> > Today I've been using 2.6.25-rc8 with an old embedded build system here
> > for my empegs.  One shell script calls out to /usr/bin/ftp to transfer
> > an image to a remote system, and then read it back again and compare.
> >
> > The compare is failing, most (but not all) of the time,
> > but only on 2.6.25-rc8, not on 2.6.24.  Verified by switching
> > back and forth between kernel versions for a short spell.
> >
> > The ftp client is netkit-ftp 0.17-16 on Kubuntu feisty.
> >
> > Switching to ncftpput/ncftpget avoids it on 2.6.25,
> > but I wonder where the problem is.
> ..
>
> Now verified that the data loss occurs in the outbound direction.
> The readback data is the same, regardless of which client s/w is used.
>
> So something in 2.6.25 is incompatible with the ftp client binary, or libs,
> that are installed here.  Or some other problem.

Or maybe it uses sendfile, and that is broken?

Also, try using ethtool to turn off TSO and/or checksumming on your NIC 
(if it is not wireless), and see if behavior changes...

	Jeff



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