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Message-ID: <1203465163.13495.102.camel@dell> Date: Tue, 19 Feb 2008 15:52:43 -0800 From: "Michael Chan" <mchan@...adcom.com> To: "Tony Battersby" <tonyb@...ernetics.com> cc: "David Miller" <davem@...emloft.net>, herbert@...dor.apana.org.au, netdev <netdev@...r.kernel.org>, gregkh@...e.de, linux-kernel@...r.kernel.org Subject: Re: TG3 network data corruption regression 2.6.24/2.6.23.4 On Tue, 2008-02-19 at 17:14 -0500, Tony Battersby wrote: > > Update: when I revert Herbert's patch in addition to applying your > patch, the iSCSI performance goes back up to 115 MB/s again in both > directions. So it looks like turning off SG for TX didn't itself cause > the performance drop, but rather that the performance drop is just > another manifestation of whatever bug is causing the data corruption. > > I do not regularly use wireshark or look at network packet dumps, so I > am not really sure what to look for. Given the above information, do > you still believe that there is value in examining the packet dump? > Can you confirm whether you're getting TCP checksum errors on the other side that is receiving packets from the 5701? You can just check statistics using netstat -s. I suspect that after we turn off SG, checksum is no longer offloaded and we are getting lots of TCP checksum errors instead that are slowing the performance. -- 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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