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
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