Date: Thu, 5 Apr 2001 11:06:56 -0700 (PDT) From: Richard Hodges <rh@matriplex.com> To: Joe Thomas <joe_thomas@cnt.com> Cc: "'Alex Huppenthal'" <alex@aspenworks.com>, Harti Brandt <brandt@fokus.gmd.de>, freebsd-atm@FreeBSD.ORG Subject: RE: ATM 4.3 and so on Message-ID: <Pine.BSF.4.10.10104051103360.45890-100000@mail.matriplex.com> In-Reply-To: <67DB78CE91D7D41190A100508BFDF5E051EF14@esply03.cnt.com>
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On Thu, 5 Apr 2001, Joe Thomas wrote:
> Some thoughts on all the different HARP discussions:
>
> I'd be surprised if FORE is doing multi-VC rate control on the
> adapter UNLESS they're running a newer version of the microcode than
> what was available when HARP was developed. On transmit, there is a
> single transmit queue which acts as PDU fifo. Each PDU in has its own
> rate info (transmit M cells followed by N idle cells) and each PDU was
> transmitted to completion before the next PDU was examined. This doesn't
> allow the adapter to intermix cells from different VCs in the output
> stream.
Thanks, that clarifies the problem quite a bit. In a way, maybe this
is actually helpful...
Alex, if you make the change to apply the rate control value to
outbound PDUs, that should throttle the whole interface down to
whatever cell rate you want. You will probably still get cell
bursts, but cell buffers in the switch may smooth this out for
you.
Thanks,
-Richard
-------------------------------------------
Richard Hodges | Matriplex, inc.
Product Manager | 769 Basque Way
rh@matriplex.com | Carson City, NV 89706
775-886-6477 | www.matriplex.com
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