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.
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.
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?
Again, thanks a lot.
________________________________
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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