linux-kernel - Re: [patch]x86: spread tlb flush vector between nodes

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Message-ID: <20101019103759.GC32212@elte.hu>
Date:	Tue, 19 Oct 2010 12:37:59 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Andi Kleen <andi@...stfloor.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"Chen, Tim C" <tim.c.chen@...el.com>
Subject: Re: [patch]x86: spread tlb flush vector between nodes


* Shaohua Li <shaohua.li@...el.com> wrote:

> On Tue, 2010-10-19 at 16:44 +0800, Ingo Molnar wrote:
> > * H. Peter Anvin <hpa@...or.com> wrote:
> > 
> > > Technically, it is way too late for anything new in this merge window, but we can 
> > > try to make a reasonable assessment of the risk since the merge window got 
> > > delayed.  However, this close to the merge window you cannot just expect to be 
> > > merged even if the patch itself is OK.
> > 
> > a prompt re-send of the patch today-ish, with proper changelog, etc. and with 
> > the new tuning in place is definitely a must.
>
> the previous patch has changelog. what did you mean a new tuning?

The new tuning would be the 8->32 patch - but that would be a more complex and 
separate (and definitely controversial) patch anyway.

So if hpa gives his ack we can try this current spread-tlb-vectors-better patch in 
-tip and see how it fares. Could you please update the changelog to specify the 20% 
improvement more precisely? What kind of workload was used and how was the 
improvement measured?

Thanks,

	Ingo
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