Date: Thu, 30 Oct 2003 08:04:58 -0800 From: Sam Leffler <sam@errno.com> To: Michal Mertl <mime@traveller.cz>, current@freebsd.org Subject: Re: jumbograms (& em) & nfs a no go Message-ID: <200310300804.58296.sam@errno.com> In-Reply-To: <20031029183808.M99053@prg.traveller.cz> References: <20031029183808.M99053@prg.traveller.cz>
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On Thursday 30 October 2003 04:46 am, Michal Mertl wrote: > 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. I've ran many jumbogram tests of machines connected with a cross-over cable and em devices at each end. If you've got a swtch in the middle make sure it does the right thing. Sam
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