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Date:      Fri, 21 May 2004 17:07:51 +0100
From:      "Steven Hartland" <killing@multiplay.co.uk>
To:        "Andrew Gallatin" <gallatin@cs.duke.edu>
Cc:        freebsd-amd64@freebsd.org
Subject:   Re: Why is MySQL nearly twice as fast on Linux/AMD64Vs.FreeBSD/AMD64?
Message-ID:  <014301c43f4d$ea2ce920$7b07000a@int.mediasurface.com>
References:  <200405202235.46755.Gregor.Bittel@GMX.de><5.2.0.9.2.20040520122752.015eec60@mail.ojoink.com><Pine.LNX.4.53.0405201129570.22287@sql01.internal.mikehost.net><5.2.0.9.2.20040520141038.0432d130@mail.ojoink.com><007701c43ec5$ff0a6fd0$b3db87d4@multiplay.co.uk><00de01c43eeb$f2753220$b3db87d4@multiplay.co.uk> <16558.7445.195712.176174@grasshopper.cs.duke.edu>

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Thanks muchly for that Andrew will try that.

Looking at the results from the netperf test posted here:
http://people.freebsd.org/~pjd/netperf/

so I'd say yes to your question. The machine moved home today
( my bedroom -> datacenter ), thank goodness its was a noisy beast.
So will have to wait till it gets installed, some time tonight, before
I can test.

    Steve

----- Original Message ----- 
From: "Andrew Gallatin"
> 
> Nice work.  Does this translate pretty much directly into netperf
> request/response results? (netperf -tTCP_RR -Hremote)
> 
> Assuming it does, have you tried "tuning" the bge interrupt coalescing
> params?  Without adding an interface, I'd just suggest doing something
> like changing sc->bge_rx_max_coal_bds from 64 to 1 around like 2350 of
> dev/bge/if_bge.c, rebuilding the driver, and seeing what changes.  I'm
> betting that will turn off recv interrupt coalescing and reduce your
> latency some.
> 
> Drew


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