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Date: Fri, 9 Apr 2004 21:31:17 +0300
From: Ruslan Ermilov <ru@FreeBSD.org>
To: Luigi Rizzo <luigi@FreeBSD.org>
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cc: net@FreeBSD.org
Subject: Re: polling(4) and rl(4)
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On Fri, Apr 09, 2004 at 10:55:03AM -0700, Luigi Rizzo wrote:
> On Fri, Apr 09, 2004 at 07:47:24PM +0300, Ruslan Ermilov wrote:
> > Hey Luigi,
> >=20
> > Have you actually measured the performance of rl(4) with polling(4)
> > enabled?  With 8139 anomaly of four (register based) TX descriptors
>=20
> no, nor i did expect any improvement -- the code was only there
> to help when the 8139C+ was supported. But now that happens in
> a different driver.
>=20
> Re. the removal, I still think it is beneficial in receiving,
> (not performancewise, just to avoid livelock), so as a temporary
> measure why don't you just short-circuit the logic that enables
> polling in the driver rather than ripping it out completely ?
>=20
Do you mean it would be okay if I just trimmed the polling support
in rl(4) to the RX part only?  I actually considered doing this,
just wasn't sure if it is good.  ;)


Cheers,
--=20
Ruslan Ermilov
ru@FreeBSD.org
FreeBSD committer

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