From: Jonathan Morton <chromatix99@gmail.com>
To: John Yates <john@yates-sheets.org>
Cc: "Dave Täht" <dave@taht.net>,
cake@lists.bufferbloat.net, lede-dev@lists.infradead.org
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 02:02:51 +0200 [thread overview]
Message-ID: <98E899EF-5E66-42CC-88AA-79FA80A4F228@gmail.com> (raw)
In-Reply-To: <CAJnXXogMukBtVQjc9r4pU+JTsPr0thYW+QMnvxptsosmZztYpQ@mail.gmail.com>
> 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
next prev parent reply other threads:[~2017-03-03 0:02 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 [this message]
2017-03-03 4:31 ` Eric Luehrsen
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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