From: David Laight <David.Laight@ACULAB.COM>
To: 'Chris Wilson' <chris@chris-wilson.co.uk>,
'Daniel Vetter' <daniel@ffwll.ch>
Cc: "'intel-gfx@lists.freedesktop.org'"
<intel-gfx@lists.freedesktop.org>,
"'dri-devel@lists.freedesktop.org'"
<dri-devel@lists.freedesktop.org>
Subject: Re: [Intel-gfx] [PATCH] drm: Inject a cond_resched() into long drm_clflush_sg()
Date: Thu, 16 Jan 2020 14:40:43 +0000 [thread overview]
Message-ID: <fbc24dd0f61e4fb8b777777d1de46ab3@AcuMS.aculab.com> (raw)
In-Reply-To: <90de9ae911dc481f9c2c62e196b2bacf@AcuMS.aculab.com>
> I'll do some measurements later this afternoon.
This is an Ivy bridge cpu, so clflush (not clflushopt).
With a cond_resched for every page I get:
(Note these calls are every 10 seconds....)
# tracer: function_graph
#
# CPU DURATION FUNCTION CALLS
# | | | | | | |
0) # 3155.126 us | drm_clflush_sg [drm]();
1) # 3067.382 us | drm_clflush_sg [drm]();
2) # 3063.766 us | drm_clflush_sg [drm]();
3) # 3092.302 us | drm_clflush_sg [drm]();
0) # 3209.486 us | drm_clflush_sg [drm]();
------------------------------------------
0) kworker-7 => kworker-319
------------------------------------------
0) # 3633.803 us | drm_clflush_sg [drm]();
------------------------------------------
1) kworker-7 => kworker-319
------------------------------------------
1) # 3090.278 us | drm_clflush_sg [drm]();
2) # 3828.108 us | drm_clflush_sg [drm]();
3) # 3049.836 us | drm_clflush_sg [drm]();
------------------------------------------
3) kworker-319 => kworker-7
------------------------------------------
3) # 3295.017 us | drm_clflush_sg [drm]();
3) # 3064.077 us | drm_clflush_sg [drm]();
------------------------------------------
0) kworker-319 => kworker-7
------------------------------------------
0) # 3182.034 us | drm_clflush_sg [drm]();
------------------------------------------
3) kworker-7 => kworker-319
------------------------------------------
3) # 3065.754 us | drm_clflush_sg [drm]();
------------------------------------------
2) kworker-319 => kworker-7
------------------------------------------
2) # 3562.513 us | drm_clflush_sg [drm]();
------------------------------------------
3) kworker-319 => kworker-7
------------------------------------------
3) # 3048.914 us | drm_clflush_sg [drm]();
3) # 3062.469 us | drm_clflush_sg [drm]();
3) # 3055.727 us | drm_clflush_sg [drm]();
------------------------------------------
0) kworker-7 => kworker-319
------------------------------------------
Without the cond_sched I suspect more of them are 3.0ms.
Not really a significant difference.
I guess the longer times are the scheduler looking for work?
I don't understand the extra traces - I'm guessing they are process switch related.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
next prev parent reply other threads:[~2020-01-16 14:40 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-15 20:52 [Intel-gfx] [PATCH] drm: Inject a cond_resched() into long drm_clflush_sg() Chris Wilson
2020-01-15 21:28 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for " Patchwork
2020-01-15 21:57 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2020-01-15 21:57 ` [Intel-gfx] ✗ Fi.CI.BUILD: warning " Patchwork
2020-01-16 6:52 ` [Intel-gfx] [PATCH] " Daniel Vetter
2020-01-16 7:40 ` Chris Wilson
2020-01-16 12:26 ` David Laight
2020-01-16 12:28 ` Chris Wilson
2020-01-16 13:58 ` David Laight
2020-01-16 14:01 ` Chris Wilson
2020-01-16 14:40 ` David Laight [this message]
2020-01-16 15:04 ` David Laight
2020-01-18 10:45 ` [Intel-gfx] ✓ Fi.CI.IGT: success for " Patchwork
2020-01-23 14:36 ` [Intel-gfx] [PATCH] " David Laight
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=fbc24dd0f61e4fb8b777777d1de46ab3@AcuMS.aculab.com \
--to=david.laight@aculab.com \
--cc=chris@chris-wilson.co.uk \
--cc=daniel@ffwll.ch \
--cc=dri-devel@lists.freedesktop.org \
--cc=intel-gfx@lists.freedesktop.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).