Date: Tue, 24 Oct 1995 14:58:55 -0400 (EDT) From: "Jonathan M. Bresler" <jmb@kryten.Atinc.COM> To: Gary Palmer <gary@palmer.demon.co.uk> Cc: chat@freebsd.org Subject: Re: moving some mail. Message-ID: <Pine.3.89.9510241415.K8705-0100000@kryten.atinc.com> In-Reply-To: <3442.814543729@palmer.demon.co.uk>
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On Tue, 24 Oct 1995, Gary Palmer wrote: > "Jonathan M. Bresler" stands accused of writing in message ID > <Pine.3.89.9510232246.E7857-0100000@kryten.atinc.com>: > >over the last two day and a half days we have AVERAGED 3.31 kBytes of > >mail per SECOND. outbound ONLY. > > What isn't so impressive is those same figures only translate into > 1.601 messages/second. Which means that each message has an average > size of 2.07k. yeah....headers and all that. some mail contains little added information and a lot of quoted text that does not help at all. (hey! who you looking at! ;) > (call me picky, but I'd start cheering at 2-3 mails/second - 1.6 > doesn't sound all that impressive, despite the fact that it probably > is) the faster the better. puts a new prespective on the number of sendmail processes running. each one has to wait for the other end to do its thing. so maybe 30-50 sendmail processes sitting on a wait channel aint that bad after all, they dont complete for kernel resources and context switches when on a wait channel (right?). given 30 sendmails and 1.6 messages/sec either each one waits about 20 seconds average or we are in deep trouble regarding context switching...not! > >mind now that the queue is a little backed up with 2000+ messages. > >half of those are due to 2 sites which are having difficulties....grrrrr! > > Urk. And I bet one of them is *.demon.co.uk? Apart from changing their > routing setup (and running into problems with the version of gated > they use, causing nasty routing failures over the past few days), bingo! that's 1 for 1, care to guess the other? > >i thnk we need to got to 64bit counters in the networking code....the > >data is moving so fast that its gone negative. > > Part of the problem possibly is that the counters (or most of them > anyhow) are (AFAIR) unsigned, but I seem to remember netstat prints > (some of) them as signed... oh, bother! Jonathan M. Bresler jmb@kryten.atinc.com | Analysis & Technology, Inc. FreeBSD Postmaster jmb@FreeBSD.Org | 2341 Jeff Davis Hwy play go. | Arlington, VA 22202 ride bike. hack FreeBSD.--ah the good life | 703-418-2800 x346
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