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Date: Fri, 24 Jul 2009 21:13:41 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: Robin Getz <rgetz@...ckfin.uclinux.org> CC: Rick Jones <rick.jones2@...com>, David Miller <davem@...emloft.net>, netdev@...r.kernel.org Subject: Re: Jumbo frame question... Robin Getz a écrit : > On Fri 24 Jul 2009 12:39, Rick Jones pondered: >> David Miller wrote: >>> From: Robin Getz <rgetz@...ckfin.uclinux.org> >>> Date: Fri, 24 Jul 2009 11:41:55 -0400 >>> >>>> Should a gigabit card, configured as 100, be sending jumbo UDP frames? >>>> >>>> My understanding, is no - this is a spec violation.. >> In so far as there is no de jure spec for Jumbo Frames, it is rather >> difficult to have a spec violation :). > > The spec I was talking about was the MTU... > > rgetz@...ky:~> /sbin/ifconfig eth0 > eth0 Link encap:Ethernet HWaddr 00:11:11:B0:A5:D4 > inet addr:192.168.0.10 Bcast:192.168.0.255 Mask:255.255.255.0 > inet6 addr: fe80::211:11ff:feb0:a5d4/64 Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:45978 errors:5 dropped:0 overruns:0 frame:0 > TX packets:44536 errors:0 dropped:0 overruns:0 carrier:0 > collisions:3193 txqueuelen:1000 > RX bytes:11583575 (11.0 Mb) TX bytes:20025122 (19.0 Mb) > Interrupt:16 > > > My MTU is 1500, but when tftp requests a block size of over that - the host > does not fragment it (like I thought it should). Which broken driver would do this me asking, and how can you be sure a jumbo frame was ever sent ? I guess your tcpdump is fooled by gso settings... Did you tried # ethtool -K eth0 gso off -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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