From: Eric Luehrsen <ericluehrsen@hotmail.com>
To: Jonathan Morton <chromatix99@gmail.com>,
John Yates <john@yates-sheets.org>
Cc: "cake@lists.bufferbloat.net" <cake@lists.bufferbloat.net>,
"lede-dev@lists.infradead.org" <lede-dev@lists.infradead.org>,
"Dave Täht" <dave@taht.net>
Subject: Re: [Cake] [LEDE-DEV] Cake SQM killing my DIR-860L - was: [17.01] Kernel: bump to 4.4.51
Date: Fri, 3 Mar 2017 04:31:23 +0000 [thread overview]
Message-ID: <DM5PR11MB1564974AF02E6511368471F7CC2B0@DM5PR11MB1564.namprd11.prod.outlook.com> (raw)
In-Reply-To: <98E899EF-5E66-42CC-88AA-79FA80A4F228@gmail.com>
On 03/02/2017 07:02 PM, Jonathan Morton wrote:
>> On 3 Mar, 2017, at 01:55, John Yates <john@yates-sheets.org> wrote:
>>
>> The virtue of a prime number of buckets is that when you mod
>> your 32-bit hash value to get a bucket index you harvest _all_
>> of the entropy in the hash, not just the entropy in the bits you
>> preserve.
> True, but you incur the cost of a division, which is very much non-trivial on ARM CPUs, which are increasingly common in CPE.
>
> - Jonathan Morton
Also with SQM you may not what idealized entropy in your queue
distribution. It is desired by some to have host-connection fairness,
and not so much interest in stream-type fairness. So overlap in a few
hash "tags" may not be always such a bad thing depending on how it works
itself out.
next prev parent reply other threads:[~2017-03-03 4:31 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <e955b05f85fea5661cfe306be0a28250@inventati.org>
[not found] ` <07479F0A-40DD-44E5-B67E-28117C7CF228@gmx.de>
[not found] ` <1488400107.3610.1@smtp.autistici.org>
[not found] ` <2B251BF1-C965-444D-A831-9981861E453E@gmx.de>
[not found] ` <1488484262.16753.0@smtp.autistici.org>
2017-03-02 21:10 ` Dave Täht
2017-03-02 23:16 ` John Yates
2017-03-03 0:00 ` Jonathan Morton
2017-03-02 23:55 ` John Yates
2017-03-03 0:02 ` Jonathan Morton
2017-03-03 4:31 ` Eric Luehrsen [this message]
2017-03-03 4:35 ` Jonathan Morton
2017-03-03 5:00 ` Eric Luehrsen
2017-03-03 5:49 ` Jonathan Morton
2017-03-03 6:21 ` Dave Taht
2017-03-06 13:30 ` Benjamin Cronce
2017-03-06 14:44 ` Jonathan Morton
2017-03-06 18:08 ` Benjamin Cronce
2017-03-06 18:46 ` Jonathan Morton
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