Johannes,
I'm glad that you take an interest. Here are my observations:
To put some meat to my claims about the performance difference, I'm
providing the summary lines from the TCP iperf server side:
[ ID] Interval Transfer Bandwidth
madwifi: [ 4] 0.0-10.5 sec 30.9 MBytes 24.7 Mbits/sec
ath5k : [ 4] 0.0-10.8 sec 26.0 MBytes 20.2 Mbits/sec
Note the significant difference in the bandwidth column.
To answer your actual question: No, there doesn't seem to be a
difference in CPU usage as shown by top. If anything, madwifi
seems to use a little bit more:
madwifi: 85,5% idle, 10% si
ath5k : 89% idle, 10% si
The CPU is:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 13
model name : Intel(R) Celeron(R) M processor 1.00GHz
stepping : 8
cpu MHz : 999.954
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov clflush
dts acpi mmx fxsr sse sse2 ss tm pbe nx up bts
bogomips : 1999.90
clflush size : 64
cache_alignment : 64
address sizes : 32 bits physical, 32 bits virtual
power management:
Anything else I can do?
--
Thanks in advance and kind regards
Joerg
----- Original Mail ----
> Von: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
> An: Joerg Pommnitz <pommnitz@xxxxxxxxx>
> CC: Adrian Chadd <adrian@xxxxxxxxxxx>; linux-wireless@xxxxxxxxxxxxxxx;
>ath5k-devel@xxxxxxxxxxxxxxx
> Gesendet: Mittwoch, den 22. Juni 2011, 15:46:56 Uhr
> Betreff: Re: Performance regression between Madwifi/net80211 and
ath5k/mac80211
>
> Do you see different CPU usage? Does it max out? If so can you profile
> it?
>
> johannes
>
>
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