Re: jumbograms (& em) & nfs a no go

From: Sam Leffler (sam_at_errno.com)
Date: 10/30/03

  • Next message: Michal Mertl: "Re: jumbograms (& em) & nfs a no go" 
    To: Michal Mertl <mime@traveller.cz>, current@freebsd.org
Date: Thu, 30 Oct 2003 08:04:58 -0800

    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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  • Next message: Michal Mertl: "Re: jumbograms (& em) & nfs a no go"

    Relevant Pages

    • Re: jumbograms (& em) & nfs a no go
      ... Michal Mertl writes: ... | On Thu, 30 Oct 2003, Sam Leffler wrote: ... |>> I wanted to test gigabit network performance and found out that current ...
      (freebsd-current)
    • Re: jumbograms (& em) & nfs a no go
      ... On Thu, 30 Oct 2003, Sam Leffler wrote: ... >> I wanted to test gigabit network performance and found out that current ... > I've ran many jumbogram tests of machines connected with a cross-over cable ...
      (freebsd-current)