lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Wed, 26 Mar 2008 10:56:17 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Paul Mackerras <paulus@...ba.org>
cc:	Andi Kleen <andi@...stfloor.org>,
	David Miller <davem@...emloft.net>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org,
	torvalds@...ux-foundation.org
Subject: Re: larger default page sizes...

On Wed, 26 Mar 2008, Paul Mackerras wrote:

> So the improvement in the user time is almost all due to the reduced
> TLB misses (as one would expect).  For the system time, using 64k
> pages in the VM reduces it by about 21%, and using 64k hardware pages
> reduces it by another 30%.  So the reduction in kernel overhead is
> significant but not as large as the impact of reducing TLB misses.

One should emphasize that this test was a kernel compile which is not 
a load that gains much from larger pages. 4k pages are mostly okay for 
loads that use large amounts of small files.


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists