Date: Mon, 19 Jun 2006 09:24:21 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: "no@spam@mgedv.net" <nospam@mgedv.net> Cc: freebsd-questions@freebsd.org Subject: Re: random(4) confusions Message-ID: <20060619142421.GA9539@dan.emsphone.com> In-Reply-To: <000b01c693a6$32b31850$01010101@avalon.lan> References: <000b01c693a6$32b31850$01010101@avalon.lan>
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In the last episode (Jun 19), no@spam@mgedv.net said:
> if i run man 4 random, i'll get the following:
>
> The kern.random.sys.burst variable instructs the kernel thread
> that pro- cesses the harvest queue to tsleep(9) briefly after
> that many events have been processed. This helps prevent the
> random device from being so com- pute-bound that it takes over
> all processing ability. A value of 0 (zero) is treated as
> infinity, and will only allow the kernel to pause if the queue
> is empty. Only values in the range [0..20] are accepted.
>
> if i try to read/set this setting, sysctl returns:
> sysctl: unknown oid 'kern.random.sys.burst'
>
> what's wrong, my kernel or the manpage?
> [6.1-RELEASE/i386]
>From looking at commit logs, the manpage wasn't updated to remove the
reference to that sysctl when it was obsoleted:
RCS file: /home/ncvs/src/sys/dev/random/randomdev.c,v
revision 1.45
date: 2003/11/17 23:02:21; author: markm; state: Exp; lines: +92 -101
Overhaul the entropy device:
o There is no need to break up the event harvesting into ${burst}
sized chunks, so retire that feature.
--
Dan Nelson
dnelson@allantgroup.com
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