| 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
| ||
|
Date: Mon, 5 Apr 2010 20:30:06 +0300 From: Pekka Enberg <penberg@...helsinki.fi> To: Christoph Lameter <cl@...ux-foundation.org> Cc: "Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>, alex.shi@...el.com, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Ma, Ling" <ling.ma@...el.com>, "Chen, Tim C" <tim.c.chen@...el.com>, Andrew Morton <akpm@...ux-foundation.org>, Tejun Heo <tj@...nel.org> Subject: Re: hackbench regression due to commit 9dfc6e68bfe6e (I'm CC'ing Tejun) On Mon, Apr 5, 2010 at 4:54 PM, Christoph Lameter <cl@...ux-foundation.org> wrote: > On Fri, 2 Apr 2010, Zhang, Yanmin wrote: > >> My testing command on my 2 socket machine: >> #hackbench 100 process 20000 >> >> With 2.6.33, it takes for about 96 seconds while 2.6.34-rc2 (or the latest tip tree) >> takes for about 101 seconds. >> >> perf shows some functions around SLUB have more cpu utilization, while some other >> SLUB functions have less cpu utilization. > > Hmnmmm... The dynamic percpu areas use page tables and that data is used > in the fast path. Maybe the high thread count causes tlb trashing? Hmm indeed. I don't see anything particularly funny in the SLUB percpu conversion so maybe this is a more issue with the new percpu allocator? -- 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