linux-kernel - Re: [take22 0/4] kevent: Generic event handling mechanism.

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Message-ID: <20061107091842.GA4608@2ka.mipt.ru>
Date:	Tue, 7 Nov 2006 12:18:43 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	zhou drangon <drangon.mail@...il.com>,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [take22 0/4] kevent: Generic event handling mechanism.

On Mon, Nov 06, 2006 at 10:17:37PM +0100, Eric Dumazet (dada1@...mosbay.com) wrote:
> Evgeniy Polyakov a écrit :
> >
> >If there would exist sockets support, then I could patch it to work with
> >kevents.
> >
> 
> OK I post here my last version of epoll_bench.

My results with AF_INET are inlined.
Hardware 2.4 Ghz Xeon w(1 CPU, HT enabled) with 1 GB of RAM.

[root@...x event]# ./epoll_bench -n 2000 -i
2000 handles setup
49758 evts/sec 1.56177 samples per call
38999 evts/sec 95 ctxt/sec 2.77247 samples per call
54042 evts/sec 130 ctxt/sec 4.19909 samples per call
60155 evts/sec 188 ctxt/sec 5.38024 samples per call
59588 evts/sec 178 ctxt/sec 6.38112 samples per call
60023 evts/sec 188 ctxt/sec 7.19564 samples per call
59694 evts/sec 186 ctxt/sec 7.93067 samples per call
60182 evts/sec 190 ctxt/sec 8.52397 samples per call
59750 evts/sec 182 ctxt/sec 9.08015 samples per call
60158 evts/sec 192 ctxt/sec 9.53548 samples per call
59739 evts/sec 188 ctxt/sec 9.97013 samples per call
60054 evts/sec 216 ctxt/sec 10.32 samples per call
59820 evts/sec 206 ctxt/sec 10.6641 samples per call
60095 evts/sec 218 ctxt/sec 10.9289 samples per call
59376 evts/sec 158 ctxt/sec 11.3231 samples per call
Avg: 57428 evts/sec
[root@...x event]# ./kevent_bench -n2000 -i
2000 handles setup
57960 evts/sec 0.276702 samples per call
59802 evts/sec 75 ctxt/sec 0.462737 samples per call
59864 evts/sec 71 ctxt/sec 0.623457 samples per call
59651 evts/sec 72 ctxt/sec 0.721579 samples per call
59504 evts/sec 84 ctxt/sec 0.804311 samples per call
61019 evts/sec 72 ctxt/sec 0.904817 samples per call
59846 evts/sec 72 ctxt/sec 0.949439 samples per call
60550 evts/sec 74 ctxt/sec 1.00416 samples per call
59421 evts/sec 66 ctxt/sec 1.04133 samples per call
60334 evts/sec 75 ctxt/sec 1.06845 samples per call
60000 evts/sec 67 ctxt/sec 1.09594 samples per call
59429 evts/sec 74 ctxt/sec 1.11404 samples per call
60508 evts/sec 77 ctxt/sec 1.14482 samples per call
59530 evts/sec 66 ctxt/sec 1.15454 samples per call
59506 evts/sec 73 ctxt/sec 1.17937 samples per call
Avg: 59794 evts/sec
[root@...x event]# ./kevent_bench -n2000 -i -f
2000 handles setup
82893 evts/sec
88624 evts/sec 390 ctxt/sec
88751 evts/sec 475 ctxt/sec
88784 evts/sec 488 ctxt/sec
88918 evts/sec 458 ctxt/sec
88866 evts/sec 504 ctxt/sec
88950 evts/sec 458 ctxt/sec
88883 evts/sec 472 ctxt/sec
88915 evts/sec 404 ctxt/sec
88836 evts/sec 368 ctxt/sec
89065 evts/sec 442 ctxt/sec
88859 evts/sec 398 ctxt/sec
89070 evts/sec 446 ctxt/sec
88809 evts/sec 428 ctxt/sec
89012 evts/sec 542 ctxt/sec
Avg: 88482 evts/sec

epoll: 57428
kevent: 59794
max: 88482

BUT!
Kevent does not support analogue for EPOLLET, i.e. the case when the
same event is used, instead kevent must modify existing one (i.e. behave
exactly like epoll without EPOLLET), so modified epoll_bench to work
without EPOLLET like kevent.
epoll with EPOLLET shows upto 71k events/sec.

Lack of such feature is a minus for kevent indeed.
I will add it into todo list behind (implemented) new ring buffer
implementation and (implemented) wake-up-one-thread flag implementation.
Hopefully I will include it into next kevent release soon, but do not 
expect it today/tomorrow, there some unrelated to hacking problems.

-- 
	Evgeniy Polyakov
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