Messages in this thread | | | Date | Mon, 3 Jun 2002 16:24:18 +1000 | From | David Gibson <> | Subject | Re: 2.4.18 orinoco.c __orinoco_ev_rx question |
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On Wed, May 29, 2002 at 09:06:13AM +0200, Wolfgang Wegner wrote: > Hi David, > On Wed, May 29, 2002 at 01:28:22PM +1000, David Gibson wrote: > > No it doesn't have to be done in the interrupt handler, it could be > > done in a bottom half. However essentially every other network driver > > does all the Rx work (up to netif_rx()) in the hard irq, so I'm > > disinclined to do it otherwise. > well, you have a point here. > However, my observation shows that this blocks interrupts for quite a > long time (800us, compared to the 700us which i remember being shouted > at in another discussion some days ago), which is quite a lot. (IMHO) > Furthermore, airo.c either has a faster way of doing so or the Cisco > PCM-352 are faster by themselves. (Did not look into airo.c as close > as orinoco.c...)
Yes, that is quite a long time. How long does it take in the airo driver? If it's possible to speed up the orinoco.c interrupt handler, rather than moving stuff into a BH I'd prefer to do that.
It's possible the Cisco cards are just faster, although I would have thought it a bit unlikely, since I beleive the recent Cisco's are based on the same MAC controller as the Lucent and Intersil cards (but different firmware).
> It was just a question if it could be done. > > I would like to try it, so another question (the rxfid stuff...): > > Could I leave just getting the rxfid (rxfid = hermes_read_regn(hw, RXFID);) > in the interrupt handler and let the bottom half process something like > a list of FIDs filled by the interrupt handler, or is there any caveat > in doing so? Would it be better (if at all possible) to leave reading > in the head in the interrupt handler, such that the status could be > evaluated and do just the copying of data (which i suspect to be the most > time-consuming) from the bottom half?
Yes, it's possible. It adds significant complexity though, so I'd really prefer not to.
-- David Gibson | For every complex problem there is a david@gibson.dropbear.id.au | solution which is simple, neat and | wrong. -- H.L. Mencken http://www.ozlabs.org/people/dgibson - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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