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Date:      Thu, 15 Jan 2015 18:58:10 +0300
From:      Slawa Olhovchenkov <slw@zxy.spb.ru>
To:        Hans Petter Selasky <hps@selasky.org>
Cc:        Adrian Chadd <adrian@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org>, Jason Wolfe <nitroboost@gmail.com>, "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org>
Subject:   Re: [RFC] kern/kern_timeout.c rewrite in progress
Message-ID:  <20150115155810.GE3698@zxy.spb.ru>
In-Reply-To: <54B7E1E4.6040906@selasky.org>
References:  <54A92ED1.2070906@selasky.org> <CAJ-Vmo=tc-hqykhyc5bQW8qd_34PZU6yfGY8wziByA0xnR3ANQ@mail.gmail.com> <54A9A71E.70609@selasky.org> <CAAAm0r39Sv3TCvwaCiNQ1Y9iBVtY_nb0A_iNOC41bgxqXmt%2B4w@mail.gmail.com> <54B29A49.3080600@selasky.org> <CAAAm0r2eNYicq%2BKKj5f5EE%2BKLPxdvy15wj1ZWS=zA6sgOtcoGQ@mail.gmail.com> <54B67DA7.3070106@selasky.org> <54B7DECF.8070209@selasky.org> <20150115154617.GB10325@zxy.spb.ru> <54B7E1E4.6040906@selasky.org>

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On Thu, Jan 15, 2015 at 04:51:00PM +0100, Hans Petter Selasky wrote:

> On 01/15/15 16:46, Slawa Olhovchenkov wrote:
> > On Thu, Jan 15, 2015 at 04:37:51PM +0100, Hans Petter Selasky wrote:
> >
> > Only stability impovement?
> > Or performance too?
> 
> Hi,
> 
> Stability improvement mostly. Should not affect performance from what I 
> know. Some changes are made about when and how we can select a different 
> callback CPU for a callout callback. Try reading the updated timeout(9) 

I am not kernel guru and can't be draw a conclusion from manual page.

> man manual page first. Maybe it answers your question. Else feel free to 
> ask here.

As I understand performance for massive TCP connections (tens of
thousands connections) will be same, no improvement, no degraded?
(very high lock congestion on TCP timers working).



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