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From: Daniel Exner <dex@dragonslave.de>
To: Borislav Petkov <bp@alien8.de>
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: Poor network performance x86_64.. also with 3.13
Date: Sun, 9 Feb 2014 16:05:11 +0100	[thread overview]
Message-ID: <20140209160511.2f67866f@Mycroft> (raw)
In-Reply-To: <20140120223752.GA3057@pd.tnic>

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Hi all,

Am Mon, 20 Jan 2014 23:37:52 +0100
schrieb Borislav Petkov <bp@alien8.de>:

> On Mon, Jan 20, 2014 at 11:27:25PM +0100, Daniel Exner wrote:
> > I just did the same procedure with Kernel Version 3.13: same poor
> > rates.
> > 
> > I think I will try to see of 3.12.6 was still ok and bisect from
> > there.
> 
> Or try something more coarse-grained like 3.11 first, then 3.12 and
> then the -rcs in between.
> 

I must apologize for suspecting the kernel for my problems. After some
bisect attempts I finaly noticed the following:

> cat /etc/sysctl.d/net.conf
> net.ipv4.tcp_window_scaling = 1
> net.core.rmem_max = 16777216
> net.ipv4.tcp_rmem = 4096 87380 16777
> net.ipv4.tcp_wmem = 4096       1638

After removing those values I finally had sane iperf values.
No idea how those got there, perhaps they made sense when I first setup
the box, which is some years ago..

Anyway, thanks all for your help :)

Greetings
Daniel Exner
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WARNING: multiple messages have this Message-ID (diff)
From: Daniel Exner <dex@dragonslave.de>
To: Borislav Petkov <bp@alien8.de>
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: Poor network performance x86_64.. also with 3.13
Date: Sun, 9 Feb 2014 16:05:11 +0100	[thread overview]
Message-ID: <20140209160511.2f67866f@Mycroft> (raw)
In-Reply-To: <20140120223752.GA3057@pd.tnic>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Hi all,

Am Mon, 20 Jan 2014 23:37:52 +0100
schrieb Borislav Petkov <bp@alien8.de>:

> On Mon, Jan 20, 2014 at 11:27:25PM +0100, Daniel Exner wrote:
> > I just did the same procedure with Kernel Version 3.13: same poor
> > rates.
> > 
> > I think I will try to see of 3.12.6 was still ok and bisect from
> > there.
> 
> Or try something more coarse-grained like 3.11 first, then 3.12 and
> then the -rcs in between.
> 

I must apologize for suspecting the kernel for my problems. After some
bisect attempts I finaly noticed the following:

> cat /etc/sysctl.d/net.conf
> net.ipv4.tcp_window_scaling = 1
> net.core.rmem_max = 16777216
> net.ipv4.tcp_rmem = 4096 87380 16777
> net.ipv4.tcp_wmem = 4096       1638

After removing those values I finally had sane iperf values.
No idea how those got there, perhaps they made sense when I first setup
the box, which is some years ago..

Anyway, thanks all for your help :)

Greetings
Daniel Exner
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  parent reply	other threads:[~2014-02-09 15:19 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-01-18 19:30 3.12.8 poor network performance x86_64 Daniel Exner
2014-01-18 19:49 ` Holger Hoffstätte
2014-01-18 19:50 ` Borislav Petkov
2014-01-18 22:46   ` Daniel Exner
2014-01-20 22:27     ` Poor network performance x86_64.. also with 3.13 Daniel Exner
2014-01-20 22:37       ` Borislav Petkov
2014-01-20 23:27         ` Branimir Maksimovic
2014-02-09 15:05         ` Daniel Exner [this message]
2014-02-09 15:05           ` Daniel Exner
2014-02-09 15:31           ` Borislav Petkov
2014-02-09 18:14             ` Eric Dumazet
2014-02-09 18:49               ` Borislav Petkov

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