From: Marek Kierdelewicz <marek@piasta.pl>
To: Stephen Hemminger <shemminger@vyatta.com>
Cc: netfilter@vger.kernel.org, marek@piasta.pl
Subject: Re: netfilter performance dependent on arch
Date: Tue, 7 Feb 2012 20:48:49 +0100 [thread overview]
Message-ID: <20120207204849.707a8a1f@catus> (raw)
In-Reply-To: <20120207111120.1d9ab37a@nehalam.linuxnetplumber.net>
>That information is out of date.
>The bulk of the slow down in 64 bit was due to the fact that IOMMU
>(CONFIG_DMAR) was enabled. The IOMMU requires programming DMA registers
>on each packet which explains the extra overhead. After disabling
>DMA remapping, the 64 bit kernel is faster because the compiler has
>more registers and can generate better code.
Thanks a lot. That's very valuable info.
Best regards,
Marek Kierdelewicz
prev parent reply other threads:[~2012-02-07 19:48 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-07 17:34 netfilter performance dependent on arch Marek Kierdelewicz
2012-02-07 18:23 ` Rick Jones
2012-02-07 18:54 ` Marek Kierdelewicz
2012-02-07 19:11 ` Stephen Hemminger
2012-02-07 19:48 ` Marek Kierdelewicz [this message]
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