From: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
To: Mikulas Patocka <mpatocka-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org,
Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>,
Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
dm-devel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
Laura Abbott <labbott-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
"Kirill A . Shutemov"
<kirill.shutemov-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Subject: Re: [PATCH] vmalloc: introduce vmap_pfn for persistent memory
Date: Wed, 8 Nov 2017 07:04:47 -0800 [thread overview]
Message-ID: <20171108150447.GA10374@infradead.org> (raw)
In-Reply-To: <alpine.LRH.2.02.1711080725490.12294-Hpncn10jQN4oNljnaZt3ZvA+iT7yCHsGwRM8/txMwJMAicBL8TP8PQ@public.gmane.org>
On Wed, Nov 08, 2017 at 07:33:09AM -0500, Mikulas Patocka wrote:
> We could use the function clwb() (or arch-independent wrapper dax_flush())
> - that uses the clflushopt instruction on Broadwell or clwb on Skylake -
> but it is very slow, write performance on Broadwell is only 350MB/s.
>
> So in practice I use the movnti instruction that bypasses cache. The
> write-combining buffer is flushed with sfence.
And what do you do for an architecture with virtuall indexed caches?
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
linux-mm@kvack.org, linux-nvdimm@lists.01.org,
Dan Williams <dan.j.williams@intel.com>,
dm-devel@redhat.com, Laura Abbott <labbott@redhat.com>,
Christoph Hellwig <hch@lst.de>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH] vmalloc: introduce vmap_pfn for persistent memory
Date: Wed, 8 Nov 2017 07:04:47 -0800 [thread overview]
Message-ID: <20171108150447.GA10374@infradead.org> (raw)
In-Reply-To: <alpine.LRH.2.02.1711080725490.12294@file01.intranet.prod.int.rdu2.redhat.com>
On Wed, Nov 08, 2017 at 07:33:09AM -0500, Mikulas Patocka wrote:
> We could use the function clwb() (or arch-independent wrapper dax_flush())
> - that uses the clflushopt instruction on Broadwell or clwb on Skylake -
> but it is very slow, write performance on Broadwell is only 350MB/s.
>
> So in practice I use the movnti instruction that bypasses cache. The
> write-combining buffer is flushed with sfence.
And what do you do for an architecture with virtuall indexed caches?
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next prev parent reply other threads:[~2017-11-08 15:04 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-07 22:03 [PATCH] vmalloc: introduce vmap_pfn for persistent memory Mikulas Patocka
2017-11-07 22:03 ` Mikulas Patocka
2017-11-08 9:59 ` Christoph Hellwig
2017-11-08 9:59 ` Christoph Hellwig
2017-11-08 12:33 ` Mikulas Patocka
2017-11-08 12:33 ` Mikulas Patocka
[not found] ` <alpine.LRH.2.02.1711080725490.12294-Hpncn10jQN4oNljnaZt3ZvA+iT7yCHsGwRM8/txMwJMAicBL8TP8PQ@public.gmane.org>
2017-11-08 15:04 ` Christoph Hellwig [this message]
2017-11-08 15:04 ` Christoph Hellwig
[not found] ` <20171108150447.GA10374-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2017-11-08 15:21 ` Mikulas Patocka
2017-11-08 15:21 ` Mikulas Patocka
2017-11-08 15:21 ` Mikulas Patocka
[not found] ` <alpine.LRH.2.02.1711081007570.8618-Hpncn10jQN4oNljnaZt3ZvA+iT7yCHsGwRM8/txMwJMAicBL8TP8PQ@public.gmane.org>
2017-11-08 15:35 ` [dm-devel] " Christoph Hellwig
2017-11-08 15:35 ` Christoph Hellwig
2017-11-08 15:35 ` Christoph Hellwig
2017-11-08 15:41 ` Dan Williams
2017-11-08 15:41 ` Dan Williams
2017-11-08 20:15 ` Mikulas Patocka
[not found] ` <alpine.LRH.2.02.1711081514320.29922-Hpncn10jQN4oNljnaZt3ZvA+iT7yCHsGwRM8/txMwJMAicBL8TP8PQ@public.gmane.org>
2017-11-08 20:25 ` Dan Williams
2017-11-08 20:25 ` Dan Williams
2017-11-08 20:25 ` Dan Williams
2017-11-09 16:40 ` Mikulas Patocka
2017-11-09 16:40 ` Mikulas Patocka
2017-11-09 16:45 ` Dan Williams
[not found] ` <CAPcyv4h48ciK7TBHm_pZ=ayUcGtDXhH-9wMV3ZAVooNs+bb0BQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-11-09 17:30 ` Mikulas Patocka
2017-11-09 17:30 ` Mikulas Patocka
2017-11-09 17:30 ` Mikulas Patocka
2017-11-09 17:35 ` Dan Williams
2017-11-09 17:35 ` Dan Williams
2017-11-08 17:42 ` Mikulas Patocka
[not found] ` <alpine.LRH.2.02.1711081236570.1168-Hpncn10jQN4oNljnaZt3ZvA+iT7yCHsGwRM8/txMwJMAicBL8TP8PQ@public.gmane.org>
2017-11-08 17:47 ` Christoph Hellwig
2017-11-08 17:47 ` Christoph Hellwig
2017-11-08 17:47 ` Christoph Hellwig
[not found] ` <20171108174747.GA12199-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2017-11-08 20:26 ` Mikulas Patocka
2017-11-08 20:26 ` Mikulas Patocka
2017-11-08 20:26 ` Mikulas Patocka
2017-11-08 21:26 ` Dan Williams
[not found] ` <CAPcyv4hR7DQ98ZCqqeyD2ihO0jWpQqPv_+s4v6iVaiNWrv96vw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-11-09 16:37 ` Mikulas Patocka
2017-11-09 16:37 ` Mikulas Patocka
2017-11-09 16:37 ` Mikulas Patocka
2017-11-09 16:49 ` Dan Williams
2017-11-09 16:49 ` Dan Williams
2017-11-09 18:13 ` Mikulas Patocka
2017-11-09 18:13 ` Mikulas Patocka
2017-11-09 18:38 ` Dan Williams
2017-11-09 18:38 ` Dan Williams
[not found] ` <CAPcyv4jsUuROY9Bk8xXupuJq22xRUDoiiTSqegv-njUR6MxeYw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-11-09 18:51 ` Mikulas Patocka
2017-11-09 18:51 ` Mikulas Patocka
2017-11-09 18:51 ` Mikulas Patocka
2017-11-09 18:58 ` Dan Williams
2017-11-09 18:58 ` Dan Williams
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