From: Trond Myklebust <trond.myklebust@fys.uio.no>
To: Bogdan Costescu <bogdan.costescu@iwr.uni-heidelberg.de>
Cc: nfs@lists.sourceforge.net
Subject: Re: nfs performance: read only/gigE/nolock/1Tb per day
Date: 23 Apr 2002 18:36:28 +0200 [thread overview]
Message-ID: <shsznzubcdv.fsf@charged.uio.no> (raw)
In-Reply-To: <Pine.LNX.4.44.0204231502320.31993-100000@kenzo.iwr.uni-heidelberg.de>
>>>>> " " == Bogdan Costescu <bogdan.costescu@iwr.uni-heidelberg.de> writes:
> How big are the datagrams compared with the MTU ? With 32K
> datagrams over Ethernet, you're talking about roughly a full Rx
> ring worth of packets (32 is common for the Rx ring size)...
It has been a while ago (I've since mothballed the machine) but I saw
it on a Pentium 90 with only 8k write sizes. 4k was fine, 8k gave
avalanches.
>> IOW: the client is just sitting there sending off ICMP
>> messages, and never reading the reply.
> Does the other side sees these messages ? If so, are there any
> response messages sent out (but which don't make it back to the
> client) ?
IIRC, yes, and the server was resending the datagrams. From the code,
it looks as if there is no attempt to stop loopback situations
occurring when this goes on:
i.e. resending an ICMP when the server resends a datagram which times
out again appears to be possible. This might be what was happening...
> Down/up was on the sending or receiving/reassembling side ?
Down/up on the receiving/reassembling side.
Cheers,
Trond
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next prev parent reply other threads:[~2002-04-23 16:36 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-22 14:49 nfs performance: read only/gigE/nolock/1Tb per day Lever, Charles
2002-04-22 15:32 ` Trond Myklebust
2002-04-22 18:52 ` Bogdan Costescu
2002-04-23 10:39 ` Trond Myklebust
2002-04-23 15:14 ` Bogdan Costescu
2002-04-23 16:36 ` Trond Myklebust [this message]
2002-04-23 18:16 ` Bogdan Costescu
2002-04-23 18:16 ` [NFS] " Bogdan Costescu
-- strict thread matches above, loose matches on Subject: below --
2002-04-22 21:45 Heflin, Roger A.
2002-04-22 16:23 Andrew Ryan
2002-04-22 18:06 ` Pedro M. Rodrigues
2002-04-21 13:08 Gavin Woodhatch
2002-04-21 3:27 jason andrade
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