Date: Wed, 21 Mar 2001 10:17:27 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: "Michael C . Wu" <keichii@iteration.net> Cc: Rik van Riel <riel@conectiva.com.br>, Peter Wemm <peter@netplex.com.au>, Alfred Perlstein <bright@wintelcom.net>, "Michael C . Wu" <keichii@iteration.net>, izero@ms26.hinet.net, cross@math.psu.edu, grog@FreeBSD.ORG, fs@FreeBSD.ORG, hackers@FreeBSD.ORG Subject: Re: tuning a VERY heavily (30.0) loaded s cerver Message-ID: <200103211817.f2LIHR416007@earth.backplane.com> References: <200103211114.f2LBE0h57371@mobile.wemm.org> <Pine.LNX.4.21.0103211328310.9056-100000@imladris.rielhome.conectiva> <20010321120620.A932@peorth.iteration.net>
next in thread | previous in thread | raw e-mail | index | archive | help
:B) Added 3gb of swap on one drive, 1gb of swap on a raid volume
: another 1gb swap on another raid volume
:C) enabled vfs.vmiodirenable and kern.ipc.shm_use_phys
:
:--
:+-----------------------------------------------------------+
:| keichii@iteration.net | keichii@freebsd.org |
I'd reduce that 3gb on that one drive to 1gb. The kernel
allocates a bitmap for 4 * (largest_swap_partition), i.e.
it will allocate a bitmap for 3gb x 4 = 12 gb worth of swap,
even though you only have 5. If you reduce the 3gb to 1gb, then
the kernel will allocate a bitmap for 1gb x 4 = 4gb worth of swap,
using 1/3 the memory for the bitmap. Each page of swap eats 2 bits of
memory for the bitmap so we aren't talking about a huge
amount of memory, but it's worth doing.
-Matt
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200103211817.f2LIHR416007>