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From: Dmitry Vyal <dmitryvyal-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Robert Sanford <rsanford-mDvk1qcdE6VWk0Htik3J/w@public.gmane.org>
Cc: dev-VfR2kkLFssw@public.gmane.org
Subject: Re: How to fight forwarding performance regression on large mempool sizes.
Date: Sun, 22 Sep 2013 23:03:40 +0400	[thread overview]
Message-ID: <523F3F0C.2010104@gmail.com> (raw)
In-Reply-To: <CAFmpvUNEtcM8TtHJhqShRggDKRT3Y0vAY9aiG=28aV9NomQRgA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

On 09/20/2013 07:34 PM, Robert Sanford wrote:
> One more point, if you're not doing this already: Allocate 2^N-1 
> mbufs, not 2^N. According to the code and comments: "The optimum size 
> (in terms of memory usage) for a mempool is when n is a power of two 
> minus one: n = (2^q - 1)."
>
Many thanks! Didn't know about it.

      parent reply	other threads:[~2013-09-22 19:03 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-09-19  7:50 How to fight forwarding performance regression on large mempool sizes Dmitry Vyal
     [not found] ` <523AACC9.8010304-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-09-19 19:39   ` Robert Sanford
     [not found]     ` <CAFmpvUNzbi7zsAOHeaR5KpX_OBpa_g-TLDr5FYmddqGGAX9pSA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-09-19 19:43       ` Venkatesan, Venky
     [not found]         ` <1FD9B82B8BF2CF418D9A1000154491D973F4AEAE-P5GAC/sN6hlcIJlls4ac1rfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2013-09-20  6:50           ` Dmitry Vyal
2013-09-20  6:48       ` Dmitry Vyal
     [not found]         ` <523BEFA3.4070209-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-09-20 14:41           ` Robert Sanford
2013-09-20 15:34           ` Robert Sanford
     [not found]             ` <CAFmpvUNEtcM8TtHJhqShRggDKRT3Y0vAY9aiG=28aV9NomQRgA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-09-22 19:03               ` Dmitry Vyal [this message]

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