linux-kernel - Re: oostore on x86

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Message-ID: <CALKntY3tnQOT5U+U85_Wj1fitztRz8zo1_75QLKu8HbCf_+hdw@mail.gmail.com>
Date:	Sun, 8 Apr 2012 22:15:53 -0400
From:	Xin Tong <xerox.time.tech@...il.com>
To:	Dave Jones <davej@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Xin Tong <xerox.time.tech@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: oostore on x86

Is there a way to relax the amd64 memory model. does the latest intel
processor micro-architecture support it ?

Xin


On Sun, Apr 8, 2012 at 7:27 PM, Dave Jones <davej@...hat.com> wrote:
> On Sun, Apr 08, 2012 at 02:49:56PM -0700, H. Peter Anvin wrote:
>  > On 04/07/2012 12:48 PM, Xin Tong wrote:
>  > > how can one enable oostore on x86, does one need to recompile the kernel ?
>  >
>  > Yes, and expect the code to have seriously bitrotted.
>
> It also only ever worked on the early IDT Winchip processors.
> They weren't particularly great when they came out in the late 90s,
> and I doubt they've improved with age.
>
> I'd estimate the number of people running anything newer than a
> 2.4 kernel on those chips to be approximating zero, largely because
> those old systems rarely had a lot of memory, and modern 2.6 capable
> distros probably run like a dog on them.
>
> I've suggested just removing that code in the past a few times.
> Even if it does still work, anyone complaining about performance loss
> of a modern kernel on something of that era can't be taken seriously.
>
>        Dave
>
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