Date: Thu, 11 Mar 2010 09:06:04 +0200 From: Ian FREISLICH <ianf@clue.co.za> To: pyunyh@gmail.com Cc: David Christensen <davidch@broadcom.com>, "current@freebsd.org" <current@freebsd.org> Subject: Re: dev.bce.X.com_no_buffers increasing and packet loss Message-ID: <E1NpcT6-000IuH-FO@clue.co.za> In-Reply-To: <20100310230220.GI10657@michelle.cdnetworks.com> References: <20100310230220.GI10657@michelle.cdnetworks.com> <E1Nnc4d-0003mB-6e@clue.co.za> <E1Nne0Q-0003uZ-OR@clue.co.za> <E1Noulp-0007Rc-Ro@clue.co.za> <20100309212139.GO1311@michelle.cdnetworks.com> <5D267A3F22FD854F8F48B3D2B52381933AF90EED69@IRVEXCHCCR01.corp.ad.broadcom.com> <20100309214012.GQ1311@michelle.cdnetworks.com> <E1NpHr0-000HWT-It@clue.co.za> <5D267A3F22FD854F8F48B3D2B52381933AF90EF16F@IRVEXCHCCR01.corp.ad.broadcom.com> <20100310195206.GB10657@michelle.cdnetworks.com> <5D267A3F22FD854F8F48B3D2B52381933AF90EF25A@IRVEXCHCCR01.corp.ad.broadcom.com>
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Pyun YongHyeon wrote: > On Wed, Mar 10, 2010 at 02:45:47PM -0800, David Christensen wrote: > > The bce(4) hardware supports a linked list of pages for RX > > buffer descriptors. The stock build supports 2 pages (RX_PAGES) > > with a total of 511 BD's per page. The hardware can support a > > maximum of 64K BD's but that would be an unnecessarily large > > amount of mbufs for an infrequent problem. I think that depends on how you define infrequent. Our use case is a largish core router. It's highly likely that we'll see this again and again in various packet storms on our network. Ian -- Ian Freislich
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