From: Matti Aarnio <matti.aarnio@zmailer.org>
To: "Richard B. Johnson" <root@chaos.analogic.com>
Cc: Bernd Petrovitsch <bernd@gams.at>, lkml <linux-kernel@vger.kernel.org>
Subject: Re: Bottleneck on /dev/null
Date: Thu, 20 Mar 2003 19:07:28 +0200 [thread overview]
Message-ID: <20030320170728.GQ29167@mea-ext.zmailer.org> (raw)
In-Reply-To: <Pine.LNX.4.53.0303201150140.4241@chaos>
On Thu, Mar 20, 2003 at 12:01:06PM -0500, Richard B. Johnson wrote:
...
> Yes. That's better. It may have been a diagnostic error
> in the code of the first person reporting this --also.
>
> The data-rate is so high that I might have wrapped several
> times! I didn't think it would be that high, only 2 to 3
> gigibyte/second, not over 4 Gb/s (with 130MHz RAM no less)
Furthermore, in Linux you are really measuring syscall overhead
to "/dev/null" write, which does never do memory transfers of
any kind from user-space to kernel.
...
> Its interesting that the data-rate is higher with the network
> plugged in and getting all those M$ broadcast messages. But, as
> expected, its more stable without.
Quite so.
> Cheers,
> Dick Johnson
/Matti Aarnio
prev parent reply other threads:[~2003-03-20 16:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-20 14:57 Srihari Vijayaraghavan
2003-03-20 15:54 ` Richard B. Johnson
2003-03-20 16:21 ` Tim Schmielau
2003-03-20 16:33 ` Bernd Petrovitsch
2003-03-20 17:01 ` Richard B. Johnson
2003-03-20 17:07 ` Matti Aarnio [this message]
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