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Date:      Wed, 01 Aug 2007 18:26:10 +0400
From:      Vladimir Ivanov <wawa@yandex-team.ru>
To:        Bill Marquette <bill.marquette@gmail.com>, freebsd-net <freebsd-net@freebsd.org>
Subject:   Re: SMPable version of EM driver
Message-ID:  <46B09802.7080908@yandex-team.ru>
In-Reply-To: <55e8a96c0708010626x7a433c21hacc124c7c70af471@mail.gmail.com>
References:  <46B07931.3080300@yandex-team.ru> <55e8a96c0708010626x7a433c21hacc124c7c70af471@mail.gmail.com>
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[-- Attachment #1 --]
Bill Marquette wrote:
> [skip]
> What type of performance differences are you seeing with these
> changes?  Is this with FreeBSD acting as a router/firewall, or purely
>   
RX queue is being processed w/more than one thread.
TX queue thread isn't locked with RX anymore.

Extra CPU time can be used by e.g. IPFW firewall or routing and so on.

Also:
+ RX and TX use different priority value. System seems to be more stable 
if RX scheduled w/less priority.
+ RX/TX stay masked if there is no thread ready to catch interrupt.

> as a server?  Any chance you are using the pf filtering engine (which
> I believe is still under giant in releng_6) with this?  Thanks
>   
I have been talked that GIANT is a big problem for pf driver and they 
can not fix it easy.

Regards,
-- 

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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