On Wed December 8 2010 18:33:23 Neo Tida wrote:
> Bruno, that was great. It worked like a charm.
> Thank you very much. You really helped me. My speed is a little less than
> madwifi, but that's great.
Glad i could help. Please ask the openwrt guys to include this patch. I did
already 2 times and got ignored. We have that really well tested here, and the
company i work for uses it in their product.
> About madwifi and 40Mbps, yes that was weird for me too. But my receive
> speed is 40Mbps ( I can see it in my task manager too ) and send speed is
> exactly 33Mbps.
How can you receive faster than you can send something? ;)
> Now with ath5k and your patch, receive speed is about
> 27Mbps and send speed is about 30Mbps.
> Is there any other trick to make it better?
None that i know of.
bruno
>
>
> ________________________________
> From: Bruno Randolf <b...@einfach.org>
> To: ath5k-devel@lists.ath5k.org
> Cc: Neo Tida <neo.t...@yahoo.com>; n...@openwrt.org
> Sent: Wed, December 8, 2010 4:34:55 AM
> Subject: Re: [ath5k-devel] ath5k low speed with ar5414 based cards
>
> On Tue December 7 2010 22:18:20 Neo Tida wrote:
> > I have a problem with ath5k. I can't get more than 14 Mbps with ath5k,
> > but with madwifi and exactly that platform, I can get about 40 Mbps.
> > For more info, I use openwrt(trunk) on two routerstation pro platform
> > with ar5414 based mini pci card in 11a mode.
> >
> > As I can get a great performance with madwifi, it's not a hw problem.
>
> 40Mbps??? Sounds incredible. I've never seen more than 33Mbps with either
> madwifi or ath5k. But I can consistently get 33Mbps with ath5k on the same
> chipset and platform.
>
> Oh - just remembering: there is a patch in OpenWRT, which limits DMA bust
> sizes to work around a HW problem, but it's too conservative. I have sent a
> patch to them but they didn't apply it. That's the change you have to make:
>
> commit dacc09a722cc0064b299b59deca1806d93d661db
> Author: Bruno Randolf <b...@einfach.org>
> Date: Tue Oct 19 12:22:57 2010 +0900
>
> mac80211: improve ar71xx PCI bug WAR
>
> Since this PCI bug affects RX only, we can keep the 128B DMA size for
> TX.
>
> We have been using this setting since month without problems and a
> significant
> performance improvement.
>
> diff --git
> a/package/mac80211/patches/201-ath5k-WAR-for-AR71xx-PCI-bug.patch
> b/package/mac80211/pa
> index 38f56ed..a0d757c 100644
> --- a/package/mac80211/patches/201-ath5k-WAR-for-AR71xx-PCI-bug.patch
> +++ b/package/mac80211/patches/201-ath5k-WAR-for-AR71xx-PCI-bug.patch
> @@ -12,7 +12,7 @@
> +#else
> + /* WAR for AR71xx PCI bug */
> + AR5K_REG_WRITE_BITS(ah, AR5K_TXCFG,
> -+ AR5K_TXCFG_SDMAMR, AR5K_DMASIZE_4B);
> ++ AR5K_TXCFG_SDMAMR, AR5K_DMASIZE_128B);
> + AR5K_REG_WRITE_BITS(ah, AR5K_RXCFG,
> + AR5K_RXCFG_SDMAMW, AR5K_DMASIZE_4B);
>
>
> +#endif
>
>
> @@ -30,7 +30,7 @@
>
>
> { AR5K_RXCFG, AR5K_DMASIZE_128B },
>
>
> +#else
>
>
> + /* WAR for AR71xx PCI bug */
>
>
> -+ { AR5K_TXCFG, AR5K_DMASIZE_4B },
>
>
> ++ { AR5K_TXCFG, AR5K_DMASIZE_128B },
>
>
> + { AR5K_RXCFG, AR5K_DMASIZE_4B },
>
>
> +#endif
>
>
> { AR5K_CFG, AR5K_INIT_CFG },
>
> Hope that helps,
> bruno
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