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Message-ID: <47FCF2DD.30705@garzik.org> Date: Wed, 09 Apr 2008 12:46:21 -0400 From: Jeff Garzik <jeff@...zik.org> To: Mark Lord <lkml@....ca> CC: "Rafael J. Wysocki" <rjw@...k.pl>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: 2.6.25-rc8: FTP transfer errors 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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