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Date:      Tue, 16 Oct 2007 12:26:43 +0400
From:      Vladimir Ivanov <wawa@yandex-team.ru>
To:        Karl Triebes <karl.triebes@gmail.com>, freebsd-net <freebsd-net@freebsd.org>
Subject:   Re: SMPable version of EM driver
Message-ID:  <471475C3.9000702@yandex-team.ru>
In-Reply-To: <26a198490710142105g8fe59c2o86ceaa10d82c3c47@mail.gmail.com>
References:  <46B07931.3080300@yandex-team.ru>	 <55e8a96c0708010626x7a433c21hacc124c7c70af471@mail.gmail.com>	 <46B09802.7080908@yandex-team.ru>	 <pvcjg3hl7flhaeoogjtot8qoj989udg7nc@4ax.com>	 <4712405B.1080808@yandex-team.ru> <26a198490710142105g8fe59c2o86ceaa10d82c3c47@mail.gmail.com>
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[-- Attachment #1 --]
Karl Triebes wrote:
> Vladamir,
>    interesting work. Do you have performance numbers with each of your
> changes to see how much each contributed? How does this method scale
> with cpu cores. With your multiple RX thread idea, do you think there
> will a lot of cache thrashing due to fact that now > 1 core is looking
> at RX from the same device?
>   
DMA activity is a main problem for cache. They have about zero cache hit 
rate even w/one CPU core I seem.
> Thanks,
>
> Karl.
>
>   
[skip]

WBR,

-- 
Vladimir Ivanov
Network Operations Center
OOO "Yandex"
t: +7 495 739-7000
f: +7 495 739-7070
@: noc@yandex.net (corporate)
  wawa@yandex-team.ru (personal)
www: www.yandex.ru
-- 


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