Date: Thu, 13 Dec 2001 10:39:07 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Luigi Rizzo <rizzo@aciri.org> Cc: current@FreeBSD.ORG Subject: Re: -current vs. -stable network performance Message-ID: <200112131839.fBDId7v70103@apollo.backplane.com> References: <20011212224206.D35108@iguana.aciri.org>
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I've noticed that -current has much lower TCP performance. I haven't
had time to investigate it but I presume there is some overhead
somewhere that is killing it.
-Matt
:Hi,
:I am testing the forwarding performance of CURRENT vs. STABLE
:(both more or less up to date, unmodified, with the latest performance
:patches to the "dc" driver, which I am using) and I am having some
:surprises.
:
:STABLE can forward approx 125Kpps, whereas CURRENT tops at approx 80Kpps.
:
:This is on the same hardware, 750MHz Athlon, fastforwarding enabled,
:a 4-port 21143 card, one input driven with a stream of up to 148Kpps
:(64 bytes each).
:
:Ability to transmit seems roughly the same (in both cases 138Kpps),
:and lack of CPU does not seem to be the problem (at least for
:CURRENT), so I am suspecting some difference in the initialization
:of PCI parameters, such as burst size etc, but I am unclear on
:where to look at. Any ideas ?
:
: cheers
: luigi
:----------------------------------+-----------------------------------------
: Luigi RIZZO, luigi@iet.unipi.it . ACIRI/ICSI (on leave from Univ. di Pisa)
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