From: Andi Kleen <ak@suse.de>
To: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
Cc: "linux-kernel" <linux-kernel@vger.kernel.org>
Subject: Re: [patch] speed up single bio_vec allocation
Date: 08 Dec 2006 03:27:54 +0100 [thread overview]
Message-ID: <p733b7rdsut.fsf@bingen.suse.de> (raw)
In-Reply-To: <000301c717da$3ecf4970$2589030a@amr.corp.intel.com>
"Chen, Kenneth W" <kenneth.w.chen@intel.com> writes:
>
> I tried to use cache_line_size() to find out the alignment of struct bio, but
> stumbled on that it is a runtime function for x86_64.
It's a single global variable access:
#define cache_line_size() (boot_cpu_data.x86_cache_alignment)
Or do you mean it caused cache misses? boot_cpu_data is cache aligned
and practically read only, so there shouldn't be any false sharing at least.
-Andi
next prev parent reply other threads:[~2006-12-08 2:27 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-04 19:27 [patch] speed up single bio_vec allocation Chen, Kenneth W
2006-12-04 20:06 ` Jens Axboe
2006-12-04 20:36 ` Chen, Kenneth W
2006-12-04 20:43 ` Jens Axboe
2006-12-06 10:08 ` Jens Axboe
2006-12-06 10:56 ` Jens Axboe
2006-12-06 18:19 ` Chen, Kenneth W
2006-12-07 19:22 ` Nate Diller
2006-12-07 19:36 ` Chen, Kenneth W
2006-12-07 21:46 ` Nate Diller
2006-12-07 21:52 ` Chen, Kenneth W
2006-12-07 22:33 ` Nate Diller
2006-12-08 8:01 ` Jens Axboe
2006-12-08 2:27 ` Andi Kleen [this message]
2006-12-08 4:23 ` Chen, Kenneth W
2006-12-08 4:37 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2006-12-08 22:14 Chen, Kenneth W
2006-12-14 20:23 ` Jens Axboe
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=p733b7rdsut.fsf@bingen.suse.de \
--to=ak@suse.de \
--cc=kenneth.w.chen@intel.com \
--cc=linux-kernel@vger.kernel.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.