simple memory malloc and free in ip_output.c

Anand Moon moon.linux at
Fri Dec 27 02:02:15 EST 2013


ip_queue_xmit will get called for every packet send, so frequent allocation and free of memory can be a problem for slab allocator.
If you need only 48 bytes of memory in a function you can chose to use array.

-Anand Moon

Version: GnuPG v1.4.14 (GNU/Linux)

On Friday, December 27, 2013 11:11 AM, Guibin(Bill) Tian <gbtian at> wrote:
It does work in your way, thanks Carson 

On Thursday, December 26, 2013, Guibin(Bill) Tian  wrote:

I tried it, still the same thing. 
>Also, there is another side effect that if I call the two lines of code above, the internet connection seems to break except to localhost. 
>On Thu, Dec 26, 2013 at 10:24 PM, bill4carson <bill4carson at> wrote:
>>On 2013年12月27日 11:16, Guibin(Bill) Tian wrote:
>>>I am doing a very simple operation at the method of ip_queue_xmit in ip_output.c.
>>>The code is very simple.
>>>char *p = kmalloc(48, GFP_KERNEL);
>>                        GFP_ATOMIC ?

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