From: Christoph Hellwig <hch@infradead.org>
To: Jason Wang <jasowang@redhat.com>
Cc: mst@redhat.com, kvm@vger.kernel.org,
virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
peterx@redhat.com, linux-mm@kvack.org, aarcange@redhat.com,
linux-arm-kernel@lists.infradead.org,
linux-parisc@vger.kernel.org
Subject: Re: [RFC PATCH V2 0/5] vhost: accelerate metadata access through vmap()
Date: Fri, 8 Mar 2019 06:12:20 -0800 [thread overview]
Message-ID: <20190308141220.GA21082@infradead.org> (raw)
In-Reply-To: <1551856692-3384-1-git-send-email-jasowang@redhat.com>
On Wed, Mar 06, 2019 at 02:18:07AM -0500, Jason Wang wrote:
> This series tries to access virtqueue metadata through kernel virtual
> address instead of copy_user() friends since they had too much
> overheads like checks, spec barriers or even hardware feature
> toggling. This is done through setup kernel address through vmap() and
> resigter MMU notifier for invalidation.
>
> Test shows about 24% improvement on TX PPS. TCP_STREAM doesn't see
> obvious improvement.
How is this going to work for CPUs with virtually tagged caches?
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Jason Wang <jasowang@redhat.com>
Cc: aarcange@redhat.com, linux-parisc@vger.kernel.org,
kvm@vger.kernel.org, mst@redhat.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, peterx@redhat.com,
virtualization@lists.linux-foundation.org, linux-mm@kvack.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC PATCH V2 0/5] vhost: accelerate metadata access through vmap()
Date: Fri, 8 Mar 2019 06:12:20 -0800 [thread overview]
Message-ID: <20190308141220.GA21082@infradead.org> (raw)
In-Reply-To: <1551856692-3384-1-git-send-email-jasowang@redhat.com>
On Wed, Mar 06, 2019 at 02:18:07AM -0500, Jason Wang wrote:
> This series tries to access virtqueue metadata through kernel virtual
> address instead of copy_user() friends since they had too much
> overheads like checks, spec barriers or even hardware feature
> toggling. This is done through setup kernel address through vmap() and
> resigter MMU notifier for invalidation.
>
> Test shows about 24% improvement on TX PPS. TCP_STREAM doesn't see
> obvious improvement.
How is this going to work for CPUs with virtually tagged caches?
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-03-08 14:12 UTC|newest]
Thread overview: 175+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-06 7:18 [RFC PATCH V2 0/5] vhost: accelerate metadata access through vmap() Jason Wang
2019-03-06 7:18 ` Jason Wang
2019-03-06 7:18 ` [RFC PATCH V2 1/5] vhost: generalize adding used elem Jason Wang
2019-03-06 7:18 ` Jason Wang
2019-03-06 7:18 ` [RFC PATCH V2 2/5] vhost: fine grain userspace memory accessors Jason Wang
2019-03-06 10:45 ` Christophe de Dinechin
2019-03-07 2:38 ` Jason Wang
2019-03-07 2:38 ` Jason Wang
2019-03-06 10:45 ` Christophe de Dinechin
2019-03-06 7:18 ` Jason Wang
2019-03-06 7:18 ` [RFC PATCH V2 3/5] vhost: rename vq_iotlb_prefetch() to vq_meta_prefetch() Jason Wang
2019-03-06 7:18 ` Jason Wang
2019-03-06 7:18 ` [RFC PATCH V2 4/5] vhost: introduce helpers to get the size of metadata area Jason Wang
2019-03-06 10:56 ` Christophe de Dinechin
2019-03-07 2:40 ` Jason Wang
2019-03-07 2:40 ` Jason Wang
2019-03-06 10:56 ` Christophe de Dinechin
2019-03-06 18:43 ` Souptick Joarder
2019-03-07 2:42 ` Jason Wang
2019-03-07 2:42 ` Jason Wang
2019-03-06 7:18 ` Jason Wang
2019-03-06 7:18 ` [RFC PATCH V2 5/5] vhost: access vq metadata through kernel virtual address Jason Wang
2019-03-06 16:31 ` Michael S. Tsirkin
2019-03-07 2:45 ` Jason Wang
2019-03-07 15:34 ` Michael S. Tsirkin
2019-03-07 19:09 ` Jerome Glisse
2019-03-07 19:09 ` Jerome Glisse
2019-03-07 19:38 ` Andrea Arcangeli
2019-03-07 19:38 ` Andrea Arcangeli
2019-03-07 20:17 ` Jerome Glisse
2019-03-07 21:27 ` Andrea Arcangeli
2019-03-07 21:27 ` Andrea Arcangeli
2019-03-08 9:13 ` Jason Wang
2019-03-08 19:11 ` Andrea Arcangeli
2019-03-08 19:11 ` Andrea Arcangeli
2019-03-11 7:21 ` Jason Wang
2019-03-11 7:21 ` Jason Wang
2019-03-08 9:13 ` Jason Wang
2019-03-11 14:45 ` Jan Kara
2019-03-11 14:45 ` Jan Kara
2019-03-07 20:17 ` Jerome Glisse
2019-03-08 8:31 ` Jason Wang
2019-03-08 8:31 ` Jason Wang
2019-03-07 15:34 ` Michael S. Tsirkin
2019-03-07 2:45 ` Jason Wang
2019-03-06 16:31 ` Michael S. Tsirkin
2019-03-07 15:47 ` Michael S. Tsirkin
2019-03-07 17:56 ` Michael S. Tsirkin
2019-03-07 19:16 ` Andrea Arcangeli
2019-03-08 8:50 ` Jason Wang
2019-03-08 8:50 ` Jason Wang
2019-03-08 14:58 ` Jerome Glisse
2019-03-11 7:18 ` Jason Wang
2019-03-11 7:18 ` Jason Wang
2019-03-08 14:58 ` Jerome Glisse
2019-03-08 19:48 ` Andrea Arcangeli
2019-03-08 19:48 ` Andrea Arcangeli
2019-03-08 20:06 ` Jerome Glisse
2019-03-08 20:06 ` Jerome Glisse
2019-03-11 7:40 ` Jason Wang
2019-03-11 7:40 ` Jason Wang
2019-03-11 12:48 ` Michael S. Tsirkin
2019-03-11 13:43 ` Andrea Arcangeli
2019-03-11 13:43 ` Andrea Arcangeli
2019-03-12 2:56 ` Jason Wang
2019-03-12 2:56 ` Jason Wang
2019-03-12 3:51 ` Michael S. Tsirkin
2019-03-12 3:51 ` Michael S. Tsirkin
2019-03-12 2:52 ` Jason Wang
2019-03-12 2:52 ` Jason Wang
2019-03-12 3:50 ` Michael S. Tsirkin
2019-03-12 3:50 ` Michael S. Tsirkin
2019-03-12 7:15 ` Jason Wang
2019-03-12 7:15 ` Jason Wang
2019-03-11 12:48 ` Michael S. Tsirkin
2019-03-07 19:16 ` Andrea Arcangeli
2019-03-07 19:17 ` Jerome Glisse
2019-03-07 19:17 ` Jerome Glisse
2019-03-08 2:21 ` Michael S. Tsirkin
2019-03-08 2:21 ` Michael S. Tsirkin
2019-03-08 2:55 ` Jerome Glisse
2019-03-08 3:16 ` Michael S. Tsirkin
2019-03-08 3:16 ` Michael S. Tsirkin
2019-03-08 3:40 ` Jerome Glisse
2019-03-08 3:40 ` Jerome Glisse
2019-03-08 3:43 ` Michael S. Tsirkin
2019-03-08 3:45 ` Jerome Glisse
2019-03-08 3:45 ` Jerome Glisse
2019-03-08 9:15 ` Jason Wang
2019-03-08 9:15 ` Jason Wang
2019-03-08 3:43 ` Michael S. Tsirkin
2019-03-08 2:55 ` Jerome Glisse
2019-03-08 8:58 ` Jason Wang
2019-03-08 8:58 ` Jason Wang
2019-03-08 12:56 ` Michael S. Tsirkin
2019-03-08 12:56 ` Michael S. Tsirkin
2019-03-08 15:02 ` Jerome Glisse
2019-03-08 15:02 ` Jerome Glisse
2019-03-08 19:13 ` Andrea Arcangeli
2019-03-08 19:13 ` Andrea Arcangeli
2019-03-07 17:56 ` Michael S. Tsirkin
2019-03-07 15:47 ` Michael S. Tsirkin
2019-03-06 7:18 ` Jason Wang
2019-03-08 14:12 ` Christoph Hellwig [this message]
2019-03-08 14:12 ` [RFC PATCH V2 0/5] vhost: accelerate metadata access through vmap() Christoph Hellwig
2019-03-11 7:13 ` Jason Wang
2019-03-11 7:13 ` Jason Wang
2019-03-11 7:13 ` Jason Wang
2019-03-11 13:59 ` Michael S. Tsirkin
2019-03-11 13:59 ` Michael S. Tsirkin
2019-03-11 18:14 ` David Miller
2019-03-11 18:14 ` David Miller
2019-03-12 2:59 ` Jason Wang
2019-03-12 2:59 ` Jason Wang
2019-03-12 2:59 ` Jason Wang
2019-03-12 3:52 ` Michael S. Tsirkin
2019-03-12 3:52 ` Michael S. Tsirkin
2019-03-12 3:52 ` Michael S. Tsirkin
2019-03-12 7:17 ` Jason Wang
2019-03-12 7:17 ` Jason Wang
2019-03-12 7:17 ` Jason Wang
2019-03-12 11:54 ` Michael S. Tsirkin
2019-03-12 11:54 ` Michael S. Tsirkin
2019-03-12 11:54 ` Michael S. Tsirkin
2019-03-12 15:46 ` James Bottomley
2019-03-12 15:46 ` James Bottomley
2019-03-12 20:04 ` Andrea Arcangeli
2019-03-12 20:04 ` Andrea Arcangeli
2019-03-12 20:04 ` Andrea Arcangeli
2019-03-12 20:53 ` James Bottomley
2019-03-12 20:53 ` James Bottomley
2019-03-12 21:11 ` Andrea Arcangeli
2019-03-12 21:11 ` Andrea Arcangeli
2019-03-12 21:19 ` James Bottomley
2019-03-12 21:19 ` James Bottomley
2019-03-12 21:53 ` Andrea Arcangeli
2019-03-12 21:53 ` Andrea Arcangeli
2019-03-12 22:02 ` James Bottomley
2019-03-12 22:02 ` James Bottomley
2019-03-12 22:50 ` Andrea Arcangeli
2019-03-12 22:50 ` Andrea Arcangeli
2019-03-12 22:50 ` Andrea Arcangeli
2019-03-12 22:57 ` James Bottomley
2019-03-12 22:57 ` James Bottomley
2019-03-12 21:53 ` Andrea Arcangeli
2019-03-12 21:11 ` Andrea Arcangeli
2019-03-13 16:05 ` Christoph Hellwig
2019-03-13 16:05 ` Christoph Hellwig
2019-03-13 16:05 ` Christoph Hellwig
2019-03-13 16:05 ` Christoph Hellwig
2019-03-13 16:37 ` James Bottomley
2019-03-13 16:37 ` James Bottomley
2019-03-14 10:42 ` Michael S. Tsirkin
2019-03-14 10:42 ` Michael S. Tsirkin
2019-03-14 10:42 ` Michael S. Tsirkin
2019-03-14 13:49 ` Jason Wang
2019-03-14 13:49 ` Jason Wang
2019-03-14 19:33 ` Andrea Arcangeli
2019-03-14 19:33 ` Andrea Arcangeli
2019-03-14 19:33 ` Andrea Arcangeli
2019-03-15 4:39 ` Jason Wang
2019-03-15 4:39 ` Jason Wang
2019-03-15 4:39 ` Jason Wang
2019-03-14 13:49 ` Jason Wang
2019-03-12 5:14 ` James Bottomley
2019-03-12 5:14 ` James Bottomley
2019-03-12 7:51 ` Jason Wang
2019-03-12 7:51 ` Jason Wang
2019-03-12 7:51 ` Jason Wang
2019-03-12 7:53 ` Jason Wang
2019-03-12 7:53 ` Jason Wang
2019-03-12 7:53 ` Jason Wang
2019-03-11 18:14 ` David Miller
2019-03-11 13:59 ` Michael S. Tsirkin
2019-03-08 14:12 ` Christoph Hellwig
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190308141220.GA21082@infradead.org \
--to=hch@infradead.org \
--cc=aarcange@redhat.com \
--cc=jasowang@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-parisc@vger.kernel.org \
--cc=mst@redhat.com \
--cc=netdev@vger.kernel.org \
--cc=peterx@redhat.com \
--cc=virtualization@lists.linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.