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

From: Michal Mertl (mime_at_traveller.cz)
Date: 10/30/03

  • Next message: Garrett Wollman: "Re: Anyone object to the following change in libc?" 
    Date: Thu, 30 Oct 2003 17:51:11 +0100 (CET)
To: Sam Leffler <sam@errno.com>

    On Thu, 30 Oct 2003, Sam Leffler wrote:

    > 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.

    I also used exclusively crossover cable. The same configuration worked
    with 4.9. The problem appears only with NFS.

    I can repeat the whole test once again to make sure I didn't overlooked
    anything. It will take some time because I had to put one of the servers
    into production. 

    -- 
Michal Mertl
_______________________________________________
freebsd-current@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
  • Next message: Garrett Wollman: "Re: Anyone object to the following change in libc?"

    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 Thursday 30 October 2003 04:46 am, Michal Mertl 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)