linux-kernel - Re: [RFC PATCH] drivers/char/random.c: Is reducing locking range like this safe?

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Message-ID: <20140609021820.2038.qmail@ns.horizon.com>
Date:	8 Jun 2014 22:18:20 -0400
From:	"George Spelvin" <linux@...izon.com>
To:	linux@...izon.com, tytso@....edu
Cc:	hpa@...ux.intel.com, linux-kernel@...r.kernel.org,
	mingo@...nel.org, price@....edu
Subject: Re: [RFC PATCH] drivers/char/random.c: Is reducing locking range like this safe?

> Summarizing that, time to feed in 32 MiB of zeros (from user-space):
> 
> 0 concurrent reads:  0.356898 0.357693
> 1 concurrent read:   0.505941 0.509075	(+42%)
> 2 concurrent reads:  0.662240 0.657055	(+84%)

Er, wait a minute... I'm not sure which kernel (patched or unpatched)
I did that measurement on.

That may be a completely useless number.  I need to compile some more
kernels and reboot a few more times.  Sorry about that.
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