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Re: "The Kernel is the Problem, Not the Solution"

Yeah, it's all the other stuff -- managing the iperf instances, making sure 
they're not all hogging CPU, splitting it across aliases, interfaces, bridges 
and VMs, etc.

All a bit tedious. Isn't there some magic load generator that already helps out 
with this sort of thing?


On 14 May 2013, at 00:00, Stephen Dolan <stephen.dolan@xxxxxxxxxxxx> wrote:

> You've probably seen this before, but it's really easy to multihome
> interfaces on linux:
>     for i in $(seq 1 254); do ifconfig eth0:$i 192.168.42.$i; done
> gives you 2^24 distinct (ip, port) pairs on one box.
> Stephen
> On Mon, May 13, 2013 at 10:50 PM, Anil Madhavapeddy <anil@xxxxxxxxxx> wrote:
>> On 13 May 2013, at 22:36, Dave Scott <Dave.Scott@xxxxxxxxxxxxx> wrote:
>>> http://highscalability.com/blog/2013/5/13/the-secret-to-10-million-concurrent-connections-the-kernel-i.html
>>> Some quite interesting stuff in there.
>> I definitely want to try out our existing TCP stack with a few million 
>> connections and see how we fare.  Perhaps we should give this a shot at the 
>> Xen hackathon on Thursday?  The hard bit is finding enough interfaces on the 
>> Linux test clients so they don't run out of ports :-P
>> -anil



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