Re: Slow receive with rtl8192cu (usb ew-7811Un)

[Larry Finger <Larry.Finger@lwfinger.net>]

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On 06/07/2011 09:38 PM, Rob Browning wrote:
> Rob Browning<rlb@defaultvalue.org>  writes:
>
>> As another data point, I just tested the same device on a second machine
>> (a desktop), and saw the same behavior -- initially high transfer rates
>> trailing off to about 60K/s.
>
> ...and another data point.  Just to be sure it wasn't that particular
> usb device, I got another that I think is the same hardware (this time
> the Airlink 101), and I see exactly the same behavior.
>
> Next I'll try a different access point -- I'll let you know what I find.
> And if there's anything else I can do to help test, please let me know.

It has been some time since you wrote this. Any changes?

I recently noticed a slow-down on my rtl8192cu doing TX TCP MAERTS tests with 
netperf. The attached patch seemed to help. If you still have the problem, does 
it help? Note: The patch is badly named - I started trying to fix a problem 
connecting with a 270 Mpbs 2.4 GHz channel. It works with 150 Mbps. On the 
higher speed network, it authenticates and associates, but no data gets through.

Larry



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Index: wireless-testing-new/drivers/net/wireless/rtlwifi/core.c
===================================================================
--- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/core.c
+++ wireless-testing-new/drivers/net/wireless/rtlwifi/core.c
@@ -610,6 +610,11 @@ static void rtl_op_bss_info_changed(stru
 
 			mac->link_state = MAC80211_NOLINK;
 			memset(mac->bssid, 0, 6);
+
+			/* reset sec info */
+			rtl_cam_reset_sec_info(hw);
+
+			rtl_cam_reset_all_entry(hw);
 			mac->vendor = PEER_UNKNOWN;
 
 			RT_TRACE(rtlpriv, COMP_MAC80211, DBG_DMESG,
@@ -1063,6 +1068,9 @@ static int rtl_op_set_key(struct ieee802
 		 *or clear all entry here.
 		 */
 		rtl_cam_delete_one_entry(hw, mac_addr, key_idx);
+
+		rtl_cam_reset_sec_info(hw);
+
 		break;
 	default:
 		RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,