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Re: port-shark/57613: Abysmal network performance on shark
The following reply was made to PR port-shark/57613; it has been noted by GNATS.
From: =?X-UNKNOWN?Q?Bj=C3=B6rn_Johannesson?= <herdware%sdf.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: port-shark-maintainer%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
netbsd-bugs%netbsd.org@localhost
Subject: Re: port-shark/57613: Abysmal network performance on shark
Date: Mon, 11 Sep 2023 21:39:52 +0000 (UTC)
On Mon, 11 Sep 2023, Martin Husemann wrote:
>
> This could depend on your switch or the negotiated link.
> Can you check ifconfig output and also error counters?
>
Well this is embarrassing. I took all the things you wanted and tested two
separate network switches. The problem turns out that "mediaopt full-duplex"
fubars everything. Don't even remember that. I briefly tested this with
netbsd-9 before going to netbsd-10 and I can remember that network was
pretty pants on that too. Unsure of when that full-duplex was added
though. Removing full-duplex makes the net behave normally.
FTR there was zero in the error counters even when using full-duplex.
Perhaps it would be possible to turn off the possibility to enable
full-duplex since it's so broken? (Other stuff connected to that switch
runs fine full-duplex.)
The other problem that nfs-root hangs going multi-user turns out
to be that /etc/rc.d/network flushes routes after setting (or not in this
case) NIS/YP domain. Since this shark is on another subnet than the file
server and the gateway the machine got from dhcpd got flushed things
break.
Setting flushroutes=NO in rc.conf fixes the problem but is that the
intended way? After network_start_domainname() flushes the route we can
never reach network_start_defaultroute() which comes later.
Anyway, sorry for the noise and please close this PR.
/B
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