linux-kernel - Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

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Message-ID: <45E7287D.7000104@densedata.com>
Date:	Thu, 01 Mar 2007 20:24:45 +0100
From:	Johann Borck <johann.borck@...sedata.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

On Thu, Mar 01, 2007 at 04:41:27PM +0100, Eric Dumazet wrote:
>> 
>> I had to loop on accept() :
>> 
>>         for (i=0; i<num; ++i) {
>>                 if (event[i].data.fd == main_server_s) {
>>                         do {
>>                                 err = evtest_callback_main(event[i].data.fd);
>>                                 } while (err != -1);
>>                         }
>>                 else
>>                         err = evtest_callback_client(event[i].data.fd);
>>         }
>> 
>> Or else we can miss an event forever...
On Thu, 1 Mar 2007, Evgeniy Polyakov wrote:
>
> The same here - I would just enable a debug to find it.
>

I reported this a while ago and suggested to have the number of 
pending accepts reported with the event to save that last syscall.
I  created an ab replacement based on kevent, and at least with my 
machines, which are comparable to each other, the load on client 
dropped from 100% to 2% or something. ab just doesn't give meaningful 
results  (if the client is not way more powerful). With that new client 
I get very similar results for epoll and kevent, from 1000 through to 
26000 concurrent requests, the results have been posted on 
kevent-homepage in october, I just checked it with new version, but 
there's no significant difference.

this is the benchmark with kevent-based client:
http://tservice.net.ru/~s0mbre/blog/2006/10/11#2006_10_11
btw, each result is average over 1,000,000 requests

and just for comparison, this is on the same machines using ab:
http://tservice.net.ru/~s0mbre/blog/2006/10/08#2006_10_08

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