5.3-STABLE/alpha: re(4) slowdown

[Doug White]

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.
>
> There haven't been any changes to if_re.c in this period.  Any other
> changes that could explain this?

Since it hasn't been asked .. have you checked the link speed and verified
it isn't negotiating at 10Mbs/half instead of gig-e or whatever you're
using?  I found an rl card (yes I know rl, not re) that decided it really
hated the bay switch it was attached to and would only negotiate
10mbit/half, even though the xl card in the same machine negotiated
100mbit/full.

Silly stuff like that, and duplex mismatches, can cause problems like this
that are seemingly random between reboots.

-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite at gumbysoft.com          |  www.FreeBSD.org