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From: Nir Tzachar <nir.tzachar@gmail.com>
To: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
	Linux Networking Development Mailing List
	<netdev@vger.kernel.org>
Cc: Ziv Ayalon <ziv@final.co.il>
Subject: Re: [RFCv4 PATCH 2/2] net: Allow protocols to provide an unlocked_recvmsg socket method
Date: Thu, 1 Oct 2009 11:49:39 +0200	[thread overview]
Message-ID: <9b2db90b0910010249h182bf5d4sc7fdaea9e1345720@mail.gmail.com> (raw)
In-Reply-To: <20090923043813.GA6464@ghostprotocols.net>

Hi Arnaldo

I have repeated the tests using net-next on top of linus' git tree (I
hope I got it right..) and the patches you sent me. Things did not get
better, and in most cases were even worse; the recvmmsg parts
distinctly showed better throughput, but the latency has more than
doubled.

The simplest test of using a batch size of 1 results with recvmmsg's
latency over 1000 micro, while regular recvmsg is around 450 micro.
(note that to use 1 packet there is a small bug in the reg_recv which
needs to be fixed. Namely, change ret = -1 to ret = 0). On the
previous system config -- part 0001 of the patch, on top of 2.6.31 --
the latency of a single packet batch is 370 micro.

So, there seems to be a regression with the kernel tree I am using, or
with part 0002 of the path. I'll try running the net-next with only
part 1 of the patch and report.

Cheers.

  parent reply	other threads:[~2009-10-01  9:49 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-09-16 17:07 [RFCv4 PATCH 2/2] net: Allow protocols to provide an unlocked_recvmsg socket method Arnaldo Carvalho de Melo
2009-09-17 14:09 ` Nir Tzachar
2009-09-17 21:21   ` Arnaldo Carvalho de Melo
2009-09-17 21:53     ` Arnaldo Carvalho de Melo
     [not found]       ` <20090923000925.GA6011@ghostprotocols.net>
     [not found]         ` <9b2db90b0909222123x7e547210p5755adf9f8ae875f@mail.gmail.com>
     [not found]           ` <20090923043813.GA6464@ghostprotocols.net>
2009-10-01  9:49             ` Nir Tzachar [this message]
2009-10-01 15:03               ` Arnaldo Carvalho de Melo

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