linux-kernel - Re: [PATCH] improve the performance of large sequential write NFS workloads

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:	Fri, 18 Dec 2009 20:41:29 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steve Rago <sar@...-labs.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, Trond.Myklebust@...app.com,
	Wu Fengguang <fengguang.wu@...el.com>,
	"jens.axboe" <jens.axboe@...cle.com>
Subject: Re: [PATCH] improve the performance of large sequential write NFS
 workloads


* Steve Rago <sar@...-labs.com> wrote:

> > Also, I don't think this needs to have a sysctl, it should just work.
> 
> The sysctl is a *good thing* in that it allows the eager writeback behavior 
> to be tuned and shut off if need be.  I can only test the changes on a 
> finite set of systems, so better safe than sorry.

This issue has been settled many years ago and that's not what we do in the 
Linux kernel. We prefer patches to core code where we are reasonably sure they 
result in good behavior - and then we fix bugs in the new behavior, if any. 

(Otherwise odd sysctls would mushroom quickly and the system would become 
untestable in practice.)

	Ingo
--
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/