[111855] in North American Network Operators' Group
Re: Linux Router: TCP slow, UDP fast
daemon@ATHENA.MIT.EDU (Chris)
Sat Feb 14 08:49:07 2009
In-Reply-To: <87ab8pkwk9.fsf@mid.deneb.enyo.de>
Date: Sat, 14 Feb 2009 13:48:53 +0000
From: Chris <chris@ghostbusters.co.uk>
To: nanog list <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
Thanks loads for the quick replies. I'll try and respond individually.
Lee > I recently disabled tcp_window_scaling and it didn't solve the
problem. I don't know enough about it. Should I enable it again ? Settings
differing from defaults are copied in my first post.
Mike > Strangely I'm not seeing any errors on either the ingress or egress
NICs:
RX packets:3371200609 errors:0 dropped:0 overruns:0 frame:0
TX packets:3412500706 errors:0 dropped:0 overruns:0 carrier:0
The only errors I see anywhere are similar on both NICs. Both connect to the
same model of switch with the same default config:
rx_long_byte_count: 1396158525465
rx_csum_offload_good: 3341342496
rx_csum_offload_errors: 89459
and it may be worth noting that flow control is on. Are these a reasonable
level of pause frames to be seeing ? They seem to be higher on non-routing
boxes.
Total bytes (TX)2466202288Unicast packets (TX)3436389971Multicast packets
(TX)213310Broadcast packets (TX)4952902Single Collision Frames (TX)0Late
Collisions (TX)0Excessive Collisions (TX)0Transmitted Pause Frames (TX)27806
Florian > They're running without obvious errors. Auto Neg has taken 1Gbps,
Full. Can Auto Neg cause these symptoms do you think ?
Thanks again,
Chris
