linux-kernel - Re: [RFC v1][PATCH]page_fault retry with NOPAGE

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] [day] [month] [year] [list]

Message-ID: <4938CF1C.9020503@gmail.com>
Date:	Fri, 05 Dec 2008 08:50:04 +0200
From:	Török Edwin <edwintorok@...il.com>
To:	Ying Han <yinghan@...gle.com>
CC:	Nick Piggin <npiggin@...e.de>, Mike Waychison <mikew@...gle.com>,
	Ingo Molnar <mingo@...e.hu>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, akpm <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Rohit Seth <rohitseth@...gle.com>,
	Hugh Dickins <hugh@...itas.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC v1][PATCH]page_fault retry with NOPAGE_RETRY

On 2008-12-05 00:27, Ying Han wrote:
> I am trying your test program(scalability) in house, but somehow i got
> different result as you saw. i created 8 files each with 1G size on
> separate drives( to avoid the latency disturbing of disk seek). I got
> this number without applying the batch based on 2.6.26. May i ask how
> to reproduce the mmap issue you mentioned?
>   

Hi,

Try using more files, and of smaller size.  I was using /usr/bin, which
has 3632 files, and 571M total.
I am using XFS filesystem: /dev/mapper/vg--all-lv--usr on /usr type xfs
(rw,noatime,logbsize=262144,logbufs=8,logdev=/dev/sdg6,inode64)


> 8 CPU
> read_worker
> 1 threads Real time: 101.058262 s (since task start)
> 2 threads Real time: 50.670456 s (since task start)
> 4 threads Real time: 25.904657 s (since task start)
> 8 threads Real time: 20.090677 s (since task start)
> --------------------------------------------------------------------------------
> mmap_worker
> 1 threads Real time: 101.340662 s (since task start)
> 2 threads Real time: 51.484646 s (since task start)
> 4 threads Real time: 28.414534 s (since task start)
> 8 threads Real time: 21.785818 s (since task start)
>   


Try 16 threads, so that there is more contention on the read side as well.

Best regards,
--Edwin
--
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/