From: "H. Peter Anvin" <hpa@zytor.com>
To: Ingo Molnar <mingo@kernel.org>, Andreas Werner <wernerandy@gmx.de>
Cc: Borislav Petkov <bp@alien8.de>,
tglx@linutronix.de, mingo@redhat.com, x86@kernel.org,
dave@linux.vnet.ibm.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] X86: MM: Add PAT Type write-through in combination with mtrr
Date: Mon, 28 Oct 2013 03:53:14 -0700 [thread overview]
Message-ID: <526E421A.3090507@zytor.com> (raw)
In-Reply-To: <20131028105101.GC6274@gmail.com>
On 10/28/2013 03:51 AM, Ingo Molnar wrote:
>>
>> If i mark the region WB and call clflush my system will crash without
>> any message, it just stop working.
>
> Yeah, I was wondering whether it's valid at all to mark IO memory as
> cacheable - with the lack of MESI transactions and all that ...
>
> So it's apparently not valid and we've got to live with WT as the
> 'best' caching/bursting method for reads.
>
On a lot of systems I'm not sure if even WT is legitimate.
-hpa
next prev parent reply other threads:[~2013-10-28 10:56 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-27 12:55 [PATCH] X86: MM: Add PAT Type write-through in combination with mtrr Andreas Werner
2013-10-27 13:34 ` Borislav Petkov
2013-10-27 16:51 ` Andreas Werner
2013-10-27 17:31 ` Borislav Petkov
2013-10-27 17:56 ` Andreas Werner
2013-10-27 19:01 ` Borislav Petkov
2013-10-28 6:29 ` Andreas Werner
2013-10-28 10:17 ` Ingo Molnar
2013-10-28 10:29 ` Borislav Petkov
2013-10-28 10:31 ` Ingo Molnar
2013-10-28 10:44 ` Borislav Petkov
2013-10-28 10:45 ` Andreas Werner
2013-10-28 10:51 ` Ingo Molnar
2013-10-28 10:53 ` H. Peter Anvin [this message]
2013-10-28 11:02 ` Andreas Werner
2013-10-28 10:31 ` H. Peter Anvin
2013-10-28 10:34 ` Andreas Werner
2013-10-28 10:57 ` Borislav Petkov
2013-10-28 11:25 ` Andreas Werner
2013-10-28 11:45 ` Borislav Petkov
2013-10-28 12:03 ` Andreas Werner
2013-10-28 13:58 ` Borislav Petkov
2013-10-28 14:19 ` Andreas Werner
-- strict thread matches above, loose matches on Subject: below --
2013-08-25 7:01 Andreas Werner
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