Date: Wed, 3 Dec 2014 17:25:28 +0100 From: Borja Marcos <borjam@sarenet.es> To: Patrick Proniewski <patpro@patpro.net> Cc: freebsd-net@freebsd.org, Steven Hartland <killing@multiplay.co.uk> Subject: Re: Horrendous upload network performance with VLAN (download seems OK) Message-ID: <F537F496-27F4-4E31-850A-641C8F3719AC@sarenet.es> In-Reply-To: <E3234CED-CEB4-48AF-B3F9-1492AFF4DB46@patpro.net> References: <727AB395-CF83-4D13-A2C3-50969C2969B0@patpro.net> <547F3352.3040101@multiplay.co.uk> <43C2162E-2B9F-437F-B4CF-E792CEC5DA7B@patpro.net> <DC8D5BD7-8743-4AB9-952B-54822723610D@sarenet.es> <E3234CED-CEB4-48AF-B3F9-1492AFF4DB46@patpro.net>
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On Dec 3, 2014, at 5:21 PM, Patrick Proniewski wrote: > On 3 d=E9c. 2014, at 17:09, Borja Marcos <borjam@sarenet.es> wrote: >=20 >> On Dec 3, 2014, at 5:05 PM, Patrick Proniewski wrote: >>=20 >>> I did and it failed, but maybe I've not used the right syntax: >>>=20 >>> # ifconfig bxe0 -vlanmtu >>> ifconfig: -vlanmtu: Invalid argument >>>=20 >>> man bxe makes me think that this driver won't allow this kind of = changes. >>=20 >> Although there's no guarantee it will solve your issues, try = disabling LRO and TSO. I've found situations in which they do more harm = than good, depending on the particular card and driver. >>=20 >> Anyway it's a cheap experiment :) >=20 > Sure.=20 > Same result unfortunately. >=20 > I've made few tcpdump experiments during my scp upload tests. One on = bxe0 that shows a lot of packets for the LLC protocol, and one on = bxe0.161 that shows many "suspected TCP retransmissions", and very few = LLC packet (6 in about 350 packets of this capture). I forgot, sorry. Sometimes you need to set the interface to down and up = again to make sure changes to flags such as LRO and TSO have been = applied :/ TSO can be disabled in a global way using a sysctl variable: = net.inet.tcp.tso Borja.
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