From: Ethan Gardener <eekee57@fastmail.fm>
To: 9fans@9fans.net
Subject: Re: [9fans] PDP11 (Was: Re: what heavy negativity!)
Date: Wed, 10 Oct 2018 11:42:17 +0100 [thread overview]
Message-ID: <1539168137.1699089.1537057784.049ED240@webmail.messagingengine.com> (raw)
In-Reply-To: <7aa1f69f4ba7fc58@orthanc.ca>
On Tue, Oct 9, 2018, at 8:14 PM, Lyndon Nerenberg wrote:
> hiro writes:
>
> > Huh? What exactly do you mean? Can you describe the scenario and the
> > measurements you made?
>
> The big one is USB. disk/radio->kernel->user-space-usbd->kernel->application.
> Four copies.
>
> I would like to start playing with software defined radio on Plan
> 9, but that amount of data copying is going to put a lot of pressure
> on the kernel to keep up. UNIX/Linux suffers the same copy bloat,
> and it's having trouble keeping up, too.
References, please. Programmers are notoriously bad at determining the cause of performance problems. Examining the source will help to see if "copy bloat" is the actual problem.
>
> --lyndon
>
--
Progress might have been all right once, but it has gone on too long -- Ogden Nash
next prev parent reply other threads:[~2018-10-10 10:42 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-08 3:38 Lucio De Re
2018-10-08 4:29 ` Digby R.S. Tarvin
2018-10-08 7:20 ` hiro
2018-10-08 12:03 ` Charles Forsyth
2018-10-08 17:20 ` hiro
2018-10-08 21:55 ` Digby R.S. Tarvin
2018-10-08 23:03 ` Dan Cross
2018-10-09 0:14 ` Bakul Shah
2018-10-09 1:34 ` Christopher Nielsen
2018-10-09 3:28 ` Lucio De Re
2018-10-09 8:23 ` hiro
2018-10-09 9:45 ` Ethan Gardener
2018-10-09 17:50 ` Bakul Shah
2018-10-09 18:57 ` Ori Bernstein
2018-10-10 7:32 ` Giacomo Tesio
2018-10-09 17:45 ` Lyndon Nerenberg
2018-10-09 18:49 ` hiro
2018-10-09 19:14 ` Lyndon Nerenberg
2018-10-09 22:05 ` erik quanstrom
2018-10-11 17:54 ` Lyndon Nerenberg
2018-10-11 18:04 ` Kurt H Maier
2018-10-11 19:23 ` hiro
2018-10-11 19:24 ` hiro
2018-10-11 19:25 ` hiro
2018-10-11 19:26 ` Skip Tavakkolian
2018-10-11 19:39 ` Lyndon Nerenberg
2018-10-11 19:44 ` Skip Tavakkolian
2018-10-11 19:47 ` Lyndon Nerenberg
2018-10-11 19:57 ` hiro
2018-10-11 20:23 ` Lyndon Nerenberg
2018-10-10 10:42 ` Ethan Gardener [this message]
2018-10-09 19:23 ` Lyndon Nerenberg
2018-10-09 19:34 ` hiro
2018-10-09 19:36 ` hiro
2018-10-09 19:40 ` Lyndon Nerenberg
2018-10-10 0:18 ` Dan Cross
2018-10-10 5:45 ` hiro
2018-10-09 22:06 ` erik quanstrom
2018-10-10 6:24 ` Bakul Shah
2018-10-10 13:58 ` erik quanstrom
2018-10-09 22:42 ` Dan Cross
2018-10-09 19:09 ` Bakul Shah
2018-10-09 19:30 ` Lyndon Nerenberg
2018-10-09 3:08 ` Digby R.S. Tarvin
2018-10-09 3:16 ` [9fans] PDP11 David Arnold
2018-10-09 4:52 ` Digby R.S. Tarvin
2018-10-09 11:58 ` [9fans] PDP11 (Was: Re: what heavy negativity!) Ethan Gardener
2018-10-09 13:59 ` erik quanstrom
2018-10-09 22:22 ` Digby R.S. Tarvin
2018-10-10 10:38 ` Ethan Gardener
2018-10-10 23:15 ` Digby R.S. Tarvin
2018-10-11 18:10 ` Lyndon Nerenberg
2018-10-11 20:55 ` Digby R.S. Tarvin
2018-10-11 21:03 ` Lyndon Nerenberg
2018-10-09 14:02 ` erik quanstrom
2018-10-08 8:12 ` Nils M Holm
2018-10-08 9:12 ` Digby R.S. Tarvin
2018-10-08 8:09 ` Nils M Holm
2018-10-09 19:47 cinap_lenrek
2018-10-09 22:01 ` erik quanstrom
2018-10-09 23:43 ` Lyndon Nerenberg
2018-10-10 5:52 ` hiro
2018-10-10 8:13 ` Digby R.S. Tarvin
2018-10-10 9:14 ` hiro
2018-10-10 13:59 ` Steve Simon
2018-10-10 21:32 ` Digby R.S. Tarvin
2018-10-11 17:43 ` Lyndon Nerenberg
2018-10-11 19:11 ` hiro
2018-10-11 19:27 ` Lyndon Nerenberg
2018-10-11 19:56 ` hiro
2018-10-10 5:57 ` hiro
2018-10-09 19:49 cinap_lenrek
2018-10-09 19:56 ` hiro
2018-10-10 0:15 cinap_lenrek
2018-10-10 0:22 ` Lyndon Nerenberg
2018-10-10 16:14 cinap_lenrek
2018-10-10 17:34 cinap_lenrek
2018-10-10 21:54 ` Steven Stallion
2018-10-10 22:29 ` Kurt H Maier
2018-10-10 22:55 ` Steven Stallion
2018-10-11 11:19 ` Aram Hăvărneanu
2018-10-11 0:26 ` Skip Tavakkolian
2018-10-11 1:03 ` Steven Stallion
2018-10-14 9:46 ` Ole-Hjalmar Kristensen
2018-10-14 10:37 ` hiro
2018-10-14 17:34 ` Ole-Hjalmar Kristensen
2018-10-14 19:17 ` hiro
2018-10-15 9:29 ` Giacomo Tesio
2018-10-10 22:19 cinap_lenrek
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