Date: Mon, 21 Apr 2003 06:47:17 -0700 From: Luigi Rizzo <rizzo@icir.org> To: Dirk-Willem van Gulik <dirkx@webweaving.org> Cc: freebsd-hackers@freebsd.org Subject: Re: wi(4) - polling(4) changes / DEVICE_POLLING Message-ID: <20030421064717.B98117@xorpc.icir.org> In-Reply-To: <20030421130029.A29555-100000@foem.leiden.webweaving.org>; from dirkx@webweaving.org on Mon, Apr 21, 2003 at 01:05:52PM %2B0200 References: <20030421130029.A29555-100000@foem.leiden.webweaving.org>
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if i remember well, the "wi" driver copies the packet from the card to the mbuf using programmed I/O. Switching to polling will just move the load under a different bucket (SYSTEM or IDLE instead of INTR) but not change the situation radically, and i doubt you will achieve significant performance improvements. This said i cannot think of issues in making wi polling-aware, as the polling code makes no assumptions on how the device works. cheers luigi On Mon, Apr 21, 2003 at 01:05:52PM +0200, Dirk-Willem van Gulik wrote: > > Is anyone actively working on making the polling(8) to the wi(4) driver ? > > As in www.wirelessleiden.nl we're seeing very significant (>80%) INTR > time spend when doing simple bridging from one wi(4) card to another on > the lower end motherboards (P1, slow P2's). > > And we have similarly seen that using DEVICE_POLLING on the sis(4) cards > in the same device would instantly drop sis0<->sis1 INTR time resources to > acceptible levels (and increase performance by almost a 2 fold). > > Or are there any fundamental issues with making wi(4) polling(4) aware ? > I.e. some specific firmware issues, etc ? > > Thanks ! > > Dw > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"
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