[Click] Is user-space Click more flexible and programmable thankernel-space Click???

[Beyers Cronje]

Hi,

(1) Sure kdb is there, but personally I feel it's much less hassle to debug
in userland.
(3) In kernel Click either allocates memory via kmalloc of vmalloc depending
on the size of memory you request. kmalloc has a 128k size limit. vmalloc
also has limitations which I cant remember off the top of my head. Either
way, in userland you have access to the full heap.
(4) In userland Click you can easily write to the filesystem, e.g. ToDump,
or makes use of Socket element for socket communications. These features are
not available in kernel.

Hope this helps.

Beyers

On Thu, Aug 11, 2011 at 10:22 PM, shule ney <neyshule at gmail.com> wrote:

> *Thanks very much for your reply, Beyers, so*
> *
> 1. for debug, which program your wanna debug actually with Click??In kernel
> we also had kdb which is available.
> for 3&4, can you explain them in a little more detail with Click, like you
> mentioned file system, socket and other userland tools. I'll appreciate it
> Beyers.*
> *
> *
> *Best Regards*
> *neyshule*
>
> 2011/8/12 <bcronje at gmail.com>
>
>> To name a few reasons I like userspace click:
>>
>> 1) much easier to debug, tools like gdb etc available
>> 2) If something goes wrong at worst the process crashes and not the whole
>> system.
>> 3) Have access to more ram than kernel module, depending on what you need
>> might be a deal breaker for kernel module.
>> 4) Have access to the filesystem, sockets and other userland tools
>> 5) Can run multiple instances of click on single server.
>> 6) Using cards like endace dag etc get great performance
>>
>> Sure there are more reasons
>>
>> Beyers
>>
>> Sent from my BlackBerry® wireless device
>>
>> -----Original Message-----
>> From: shule ney <neyshule at gmail.com>
>> Sender: click-bounces at pdos.csail.mit.edu
>> Date: Fri, 12 Aug 2011 03:01:48
>> To: <click at pdos.csail.mit.edu>
>> Subject: [Click] Is user-space Click more flexible and programmable than
>>        kernel-space Click???
>>
>> Hi all:
>> I have a question about the user and kernel space Click, no doubt kernel
>> Click performs much better cuz it resides in kernel and take place of the
>> original Linux network stack, so what's the meaning of user Click?? Is it
>> more flexible and programmable or is there some other advantage that user
>> Click have??? Thanks very much to reply.
>>
>> Best Regards
>> _______________________________________________
>> click mailing list
>> click at amsterdam.lcs.mit.edu
>> https://amsterdam.lcs.mit.edu/mailman/listinfo/click
>>
>
>