linux-kernel - Re: [PATCH 1/8] pmem: Initial version of persistent memory driver

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Date:	Wed, 18 Mar 2015 11:06:46 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Boaz Harrosh <boaz@...xistor.com>
Cc:	Matthew Wilcox <willy@...ux.intel.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	X86 ML <x86@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Dan Williams <dan.j.williams@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	"Roger C. Pao" <rcpao.enmotus@...il.com>,
	linux-nvdimm <linux-nvdimm@...ts.01.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 1/8] pmem: Initial version of persistent memory driver

On Mar 9, 2015 8:20 AM, "Boaz Harrosh" <boaz@...xistor.com> wrote:
>
> On 03/06/2015 01:03 AM, Andy Lutomirski wrote:
> <>
> >
> > I think it would be nice to have control over the caching mode.
> > Depending on the application, WT or UC could make more sense.
> >
>
> Patches are welcome. say
>         map=sss@aaa:WT,sss@aaa:CA, ...
>
> But for us, with direct_access(), all benchmarks show a slight advantage
> for the cached mode.

I'm sure cached is faster.  The question is: who flushes the cache?

--Andy
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