[OpenAFS-devel] Andrew Deason's OpenAFS RX performance patches

[Jeffrey E Altman]

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From: Jeffrey E Altman <jaltman@auristor.com>
To: "John P Janosik (jpjanosi@us.ibm.com)" <jpjanosi@us.ibm.com>
Cc: "openafs-devel@openafs.org" <openafs-devel@openafs.org>,
 Benjamin Kaduk <kaduk@mit.edu>
Message-ID: <1caf1de4-4c3a-3333-23d6-dfe66aff4456@auristor.com>
Subject: Re: [OpenAFS-devel] Andrew Deason's OpenAFS RX performance patches
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John,

What are your observations of how this code behaves on congested links.=20
  I expect that the sorting of received packets distorts the ACK clock=20
and packet skew measurements reducing the ability to accurately measure=20
the congestion window.  Processing ACK packets in bulk is likely to=20
produce a bursty transmission pattern which can result in overflowing=20
the link capacity.  As a result, fairness is reduced and packet loss=20
might be increased.

Jeffrey Altman
AuriStor, Inc.

On 5/6/2021 10:22 PM, John P Janosik (jpjanosi@us.ibm.com) wrote:
> Hi Ben,
>=20
> We have been importing these patches into our IBM internal OpenAFS 1.8.=
X=20
> builds for over a year and have had our busiest cells running these=20
> versions since fall last year. =C2=A0We hit some deadlock issue early o=
n but=20
> that was fixed and I believe those patches made it to gerrit as well.
>=20
> I did the work to get the patches to apply to the versions of OpenAFS w=
e=20
> are running, but I don't feel confident calling it a review. =C2=A0I mi=
ssed=20
> the deadlock issue until we actually put it into production :).
>=20
> John Janosik
> jpjanosi@us.ibm.com


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