Date: Thu, 30 Oct 2003 13:46:54 +0100 (CET) From: Michal Mertl <mime@traveller.cz> To: current@freebsd.org Subject: jumbograms (& em) & nfs a no go Message-ID: <20031029183808.M99053@prg.traveller.cz>
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I wanted to test gigabit network performance and found out that current (from 5.0 to up to date -current) doesn't fully work with jumbograms (MTU set to 6000), Intel adapters and nfs (both UDP and TCP). I checked that the same thing works with 4.9. I then left one computer at 4.9 and upgraded the other to 5.0. When I mount a partition from 5.0 machine I found out, that copying reliably works only from 5.0 to 4.9. The other way around I see messages 'em0: discard oversize frame (ether type 800 flags 3 len 67582 > max 6014)' on 5.0 and the copying stalls. On 4.9 machine I later see 'nfs server 10.0.0.2:/usr: not responding'. The interface is stuck for some time - can be revived by changing mtu back to 1500 and down/up sequence. -- Michal Mertl
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