5.3-STABLE/alpha: re(4) slowdown

[Robert Watson]

On Thu, 23 Dec 2004, Christian Weisgerber wrote:

> After updating my 5.3-STABLE/alpha from Dec 4 to Dec 22 on RELENG_5,
> network _receiving_ throughput on its re(4) interface has collapsed to a
> maximum of 0.5-1.0 MB/s.  (Figures from scp.  Yes, I realize this is not
> the most suitable test, but the box is not CPU starved and used to
> receive data at several times that rate.)  I use the machine as X11
> display and quickly noticed that remote X11 apps had become unusually
> slow.  IPv4 and v6 are equally affected. 

Could you use a tool like netperf to see whether the slowdown is specific
to TCP, or affects UDP also?  There have been some TCP tweaks and
bugfixes, and this would help isolate that.  Seeing the results of a
netperf run with the UDP_RR and UDP_STREAM tests in the "before" and
"after" scenarios would be helpful.

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert at fledge.watson.org      Principal Research Scientist, McAfee Research


> 
> There haven't been any changes to if_re.c in this period.  Any other
> changes that could explain this?
> 
> -- 
> Christian "naddy" Weisgerber                          naddy at mips.inka.de
> 
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