From owner-freebsd-net  Fri Oct 18 13:57:39 2002
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From: "Petri Helenius" <pete@he.iki.fi>
To: "Prafulla Deuskar" <pdeuskar@FreeBSD.ORG>
Cc: "Luigi Rizzo" <rizzo@icir.org>, "Lars Eggert" <larse@ISI.EDU>,
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Subject: Re: ENOBUFS
Date: Fri, 18 Oct 2002 23:58:03 +0300
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> Transmit/Receive Interrupt Delay values are in units of 1.024 microseconds.
> The em driver currently uses these to enable interrupt coalescing on the
cards.
>
Is this one and 24 one thousandth of microseconds or 1024 microseconds which
equals to about one millisecond and sounds quite a lot?

With former, em would "top out" at about 35000 interrupts a second.
(times two for two interfaces) With 256 receive descriptors available this would
translate to about 9Mpps :-)

Pete



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