Date: Tue, 11 May 2004 12:18:04 +0300 From: Ruslan Ermilov <ru@freebsd.org> To: Mike Silbersack <silby@silby.com> Cc: GiZmen <gizmen@blurp.one.pl> Subject: Re: device pooling and high interrupts Message-ID: <20040511091804.GB66077@ip.net.ua> In-Reply-To: <20040424131214.B5713@odysseus.silby.com> References: <20040424150050.GA93683@blurp.one.pl> <20040424131214.B5713@odysseus.silby.com>
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--61jdw2sOBCFtR2d/ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Apr 24, 2004 at 01:14:26PM -0500, Mike Silbersack wrote: >=20 > On Sat, 24 Apr 2004, GiZmen wrote: >=20 > > Hello, > > > > I am runnign freebsd 5.2.1 on 386 arch with two rl lan cards. My mainbo= ard > > is on VIA KT 266A with AMD athlon 1.1. > > I read man polling and i have HZ=3D1000. My problem is that when i set = up > > sysctl variable kern.polling.enable=3D1 my interrupts greatly increase. > > When my system is idle and indicate 0-1% interrupts with out polling. > > and when i turn on polling interrupts goes up to about 20% on idle syst= em. > > Is it normal ? I never before use polling and i dont know that i have > > something bad in my system ? > > > > Can somebody explain me this ? > > > > thx > > -- > > Best Regards: > > GiZmen >=20 > Ruslan can probably jump in and give you a better explanation than I can, > but I'll try to provide a quick answer. In short, the rl cards + driver > are not well suited to polling and will not work well with it enabled. > Support for polling on rl may in fact be removed as a result of this. >=20 Well, basically, 8139's TX/RX engine is just not worth for use with polling(4). Now that we have per-interface polling(4) controls, I suggest that we leave it _disabled_ for rl(4) by default. My tests have shown that I could only get a comparable throughput with rl(4) given HZ=3D5000, which is *ahem* quite large to be really useful. Cheers, --=20 Ruslan Ermilov ru@FreeBSD.org FreeBSD committer --61jdw2sOBCFtR2d/ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD4DBQFAoJpMUkv4P6juNwoRAswRAJ47GNefp6R4GJ7Lq9BDk8EC8Z4ZPwCY4DUi GdG0HuAuPh5eemHE28xLOg== =q+sW -----END PGP SIGNATURE----- --61jdw2sOBCFtR2d/--
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