[Click] click optimize efficiency

[Yongheng Qi]

Dear Cliff

My system use FromDevice get packet from wireless and ethernet driver. you
mean FromDeivce used interrupt is irq but not the softirq?

I can't distinguish between irq and softirq at driver , FromDevice and
ToDevice.

2009/11/29 Cliff Frey <cliff at meraki.com>

> 56% softirq implies to me that 56% of the time is spent in the packet
> receive functions in your ethernet or wireless driver.... as click should
> not be running at softirq context.  15% irq means that 15% of the time is
> actually in interrupt handlers, again that is likely your wireless and/or
> ethernet drivers.  So I don't think that your performance problem is in
> kclick itself.  Probably you could get 10% better performance if you were
> able to get rid of many many click elements in your data path... but I
> really think that you should be looking at your ethernet/wireless drivers
> instead.
>
> As I said in my earlier email, you need to break down your problem into
> smaller pieces before you can blame kclick for the performance.  You could
> also enable CONFIG_PROFILE in linux, which could give you insight into how
> much time your drivers are spending on what lines of code... but it is a
> fair amount of work.  In addition, with some work you can get linux to also
> profile your kernel modules... for instance:
> http://lkml.indiana.edu/hypermail/linux/kernel/0405.1/1115.html
>
> Good luck.
>
> Cliff
>
>
> On Sat, Nov 28, 2009 at 12:50 AM, Yongheng Qi <jetever at gmail.com> wrote:
>
>> I tested the NotifierQueue,  the instance is the same as before.
>>
>> anyone have ideas? Thanks.
>>
>> This is the top result:
>>
>> Mem: 20540K used, 106700K free, 0K shrd, 0K buff, 6656K cached
>> CPU:   0% usr  27% sys   0% nice   0% idle   0% io  15% irq  56% softirq
>> Load average: 0.95 0.88 0.50
>>  PID  PPID USER     STAT   VSZ %MEM %CPU COMMAND
>>  777     2 root     RW       0   0%  99% [kclick]
>>  807   691 root     R     1960   2%   0% top
>>  682   664 root     S     1992   2%   0% /usr/sbin/dropbear -p 22
>>  691   682 root     S     1972   2%   0% -ash
>>
>>
>


-- 
Yongheng Qi

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