Bug #162

TX_RETRY still too high

Added by Dave Täht on May 18, 2011. Updated on Aug 3, 2011.
Closed Normal Andrew McGregor

Description

I see latencies as high as 60ms under load for ping [12:45]
and NEVER a packet loss.
I think I only set TX_RETRY down to 2.
yeah, with my patch i still haven’t found a decent queue length limit
that doesn’t hurt aggregation throughput
There’s another RETRY in hardware?
but at least i’ve been able to keep the non-aggregated latency low
without hurting throughput at all
nbd: you know me, I don’t give a F* about aggregation throughpt…
cool [12:46]
that’s a start
I have routers going to the third world… Today.
what TX_RETRY are you talking about?
The amount of wireless-n down there is probably non-existent
-#define ATH_TXMAXTRY 13 [12:47]
+#define ATH_TXMAXTRY 2
#define ATH_MGT_TXMAXTRY 4

#define TID_TO_WME_AC(_tid) \
@ -542,7 +542,7@
#define DEFAULT_CACHELINE 32
#define ATH_REGCLASSIDS_MAX 10
#define ATH_CABQ_READY_TIME 80 /* % of beacon interval */
-#define ATH_MAX_SW_RETRIES 10
+#define ATH_MAX_SW_RETRIES 2

ah
ATH_TXMAXTRY is unused [12:48]
except when using the ath9k rate control module
but that one’s crappy anyway
and openwrt doesn’t use it
I figured.
init.c: hw->max_rate_tries = 10;
How is germany in June? [12:49]
sigh
too late to change now, but good to know.
germany’s nice in june

History

Updated by Dave Täht on Jul 27, 2011.
Updated by Dave Täht on Jul 31, 2011.
Updated by Dave Täht on Aug 3, 2011.
basically #216 covers this issue.

This is a static export of the original bufferbloat.net issue database. As such, no further commenting is possible; the information is solely here for archival purposes.

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