Hi,
Presumably, you are using the minstrel rate algorithm. This is the
default rate algorithm in the linux kernel, and works well.
I suggest you add code to minstrel to process the feedback from radio.
This will tell you how successful it was to transmit a packet, and how
many attempts were required. From this information, you can "derive" the
time taken to transmit the packet.
Derek.
On Tue, 26 Jan 2010, Xingang Zhang wrote:
Thanks for your quick reply. It's really helpful.
You know, I am trying to compare the timestamp of each packet and
measure the sum of transmit delay and queuing delay. with so small
round up time, it looks like I can not use this one from the
ath5k_tx_status.
Any better idea?
Thanks.
Ethan
On Tue, Jan 26, 2010 at 2:25 PM, Derek Smithies <de...@indranet.co.nz> wrote:
Hi,
ts_tstamp is the lowest 16 bits of the 64bit timestamp.
The time is in microseconds, so ts_tstamp wraps round every 32.768ms.
The 64bit timestamp wraps around every 580 000 years
ts_tstamp is from the 64bit timestamp from the radio card, and is totally
different to jiffies from the kernel.
Derek.
On Tue, 26 Jan 2010, Xingang Zhang wrote:
Hello,
I am wondering how to interpret the meaning of ts_tstamp? I can tell
it's u16 from hardware, but have no idea how to compare that with the
value of jiffies or some other time from kernel.
Thanks for any input.
Best,
Ethan
--
Derek Smithies Ph.D.
IndraNet Technologies Ltd.
ph +64 3 365 6485
Web: http://www.indranet-technologies.com/
"The only thing IE should be used for is to download Fire Fox"
"My favorite language is call STAR. It's extremely concise. It has
exactly one verb '*', which does exactly what I want at the moment."
--Larry Wall
--
Derek Smithies Ph.D.
IndraNet Technologies Ltd.
ph +64 3 365 6485
Web: http://www.indranet-technologies.com/
"The only thing IE should be used for is to download Fire Fox"
"My favorite language is call STAR. It's extremely concise. It has
exactly one verb '*', which does exactly what I want at the moment."
--Larry Wall_______________________________________________
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