From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>,
Andy Lutomirski <luto@kernel.org>,
David Woodhouse <dwmw2@infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
sparclinux@vger.kernel.org, Joerg Roedel <jroedel@suse.de>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Cornelia Huck <cornelia.huck@de.ibm.com>,
Sebastian Ott <sebott@linux.vnet.ibm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Christoph Hellwig <hch@lst.de>, KVM <kvm@vger.kernel.org>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
linux-s390 <linux-s390@vger.kernel.org>,
Linux Virtualization <virtualization@lists.linux-foundation.org>
Subject: Re: [PATCH v4 0/6] virtio core DMA API conversion
Date: Wed, 11 Nov 2015 06:37:38 +1100 [thread overview]
Message-ID: <1447184258.31884.91.camel@kernel.crashing.org> (raw)
In-Reply-To: <20151110142633-mutt-send-email-mst@redhat.com>
On Tue, 2015-11-10 at 14:43 +0200, Michael S. Tsirkin wrote:
> But not virtio-pci I think - that's broken for that usecase since we use
> weaker barriers than required for real IO, as these have measureable
> overhead. We could have a feature "is a real PCI device",
> that's completely reasonable.
Do we use weaker barriers on the Linux driver side ? I didn't think so
...
Cheers,
Ben.
WARNING: multiple messages have this Message-ID (diff)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Joerg Roedel <jroedel@suse.de>, KVM <kvm@vger.kernel.org>,
linux-s390 <linux-s390@vger.kernel.org>,
Sebastian Ott <sebott@linux.vnet.ibm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andy Lutomirski <luto@amacapital.net>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Christoph Hellwig <hch@lst.de>, Andy Lutomirski <luto@kernel.org>,
sparclinux@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
Linux Virtualization <virtualization@lists.linux-foundation.org>,
David Woodhouse <dwmw2@infradead.org>,
"David S. Miller" <davem@davemloft.net>,
Martin Schwidefsky <schwidefsky@de.ibm.com>
Subject: Re: [PATCH v4 0/6] virtio core DMA API conversion
Date: Wed, 11 Nov 2015 06:37:38 +1100 [thread overview]
Message-ID: <1447184258.31884.91.camel@kernel.crashing.org> (raw)
In-Reply-To: <20151110142633-mutt-send-email-mst@redhat.com>
On Tue, 2015-11-10 at 14:43 +0200, Michael S. Tsirkin wrote:
> But not virtio-pci I think - that's broken for that usecase since we use
> weaker barriers than required for real IO, as these have measureable
> overhead. We could have a feature "is a real PCI device",
> that's completely reasonable.
Do we use weaker barriers on the Linux driver side ? I didn't think so
...
Cheers,
Ben.
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
WARNING: multiple messages have this Message-ID (diff)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Joerg Roedel <jroedel@suse.de>, KVM <kvm@vger.kernel.org>,
linux-s390 <linux-s390@vger.kernel.org>,
Sebastian Ott <sebott@linux.vnet.ibm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andy Lutomirski <luto@amacapital.net>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Christoph Hellwig <hch@lst.de>, Andy Lutomirski <luto@kernel.org>,
sparclinux@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
Linux Virtualization <virtualization@lists.linux-foundation.org>,
David Woodhouse <dwmw2@infradead.org>,
"David S. Miller" <davem@davemloft.net>,
Martin Schwidefsky <schwidefsky@de.ibm.com>
Subject: Re: [PATCH v4 0/6] virtio core DMA API conversion
Date: Tue, 10 Nov 2015 19:37:38 +0000 [thread overview]
Message-ID: <1447184258.31884.91.camel@kernel.crashing.org> (raw)
In-Reply-To: <20151110142633-mutt-send-email-mst@redhat.com>
On Tue, 2015-11-10 at 14:43 +0200, Michael S. Tsirkin wrote:
> But not virtio-pci I think - that's broken for that usecase since we use
> weaker barriers than required for real IO, as these have measureable
> overhead. We could have a feature "is a real PCI device",
> that's completely reasonable.
Do we use weaker barriers on the Linux driver side ? I didn't think so
...
Cheers,
Ben.
next prev parent reply other threads:[~2015-11-10 20:31 UTC|newest]
Thread overview: 116+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-30 1:09 [PATCH v4 0/6] virtio core DMA API conversion Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 1/6] virtio-net: Stop doing DMA from the stack Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 13:55 ` Christian Borntraeger
2015-10-30 13:55 ` Christian Borntraeger
2015-10-31 5:02 ` Andy Lutomirski
2015-10-31 5:02 ` Andy Lutomirski
2015-10-31 5:02 ` Andy Lutomirski
2015-10-30 13:55 ` Christian Borntraeger
2015-10-30 1:09 ` [PATCH v4 2/6] virtio_ring: Support DMA APIs Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 12:01 ` Cornelia Huck
2015-10-30 12:01 ` Cornelia Huck
2015-10-30 12:01 ` Cornelia Huck
2015-10-30 12:05 ` Christian Borntraeger
2015-10-30 12:05 ` Christian Borntraeger
2015-10-30 12:05 ` Christian Borntraeger
2015-10-30 18:51 ` Andy Lutomirski
2015-10-30 18:51 ` Andy Lutomirski
2015-10-30 18:51 ` Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 3/6] virtio_pci: Use the DMA API Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 4/6] virtio: Add improved queue allocation API Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 5/6] virtio_mmio: Use the DMA API Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 6/6] virtio_pci: " Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:17 ` [PATCH v4 0/6] virtio core DMA API conversion Andy Lutomirski
2015-10-30 1:17 ` Andy Lutomirski
2015-10-30 1:17 ` Andy Lutomirski
2015-10-30 9:57 ` Christian Borntraeger
2015-10-30 9:57 ` Christian Borntraeger
2015-10-30 9:57 ` Christian Borntraeger
2015-11-09 12:15 ` Michael S. Tsirkin
2015-11-09 12:15 ` Michael S. Tsirkin
2015-11-09 12:15 ` Michael S. Tsirkin
2015-11-09 12:27 ` Paolo Bonzini
2015-11-09 12:27 ` Paolo Bonzini
2015-11-09 12:27 ` Paolo Bonzini
2015-11-09 22:58 ` Benjamin Herrenschmidt
2015-11-09 22:58 ` Benjamin Herrenschmidt
2015-11-09 22:58 ` Benjamin Herrenschmidt
2015-11-10 0:46 ` Andy Lutomirski
2015-11-10 0:46 ` Andy Lutomirski
2015-11-10 0:46 ` Andy Lutomirski
2015-11-10 2:04 ` Benjamin Herrenschmidt
2015-11-10 2:04 ` Benjamin Herrenschmidt
2015-11-10 2:04 ` Benjamin Herrenschmidt
2015-11-10 2:18 ` Andy Lutomirski
2015-11-10 2:18 ` Andy Lutomirski
2015-11-10 2:18 ` Andy Lutomirski
2015-11-10 5:26 ` Benjamin Herrenschmidt
2015-11-10 5:26 ` Benjamin Herrenschmidt
2015-11-10 5:26 ` Benjamin Herrenschmidt
2015-11-10 5:33 ` Andy Lutomirski
2015-11-10 5:33 ` Andy Lutomirski
2015-11-10 5:33 ` Andy Lutomirski
2015-11-10 5:28 ` Benjamin Herrenschmidt
2015-11-10 5:28 ` Benjamin Herrenschmidt
2015-11-10 5:28 ` Benjamin Herrenschmidt
2015-11-10 5:35 ` Andy Lutomirski
2015-11-10 5:35 ` Andy Lutomirski
2015-11-10 5:35 ` Andy Lutomirski
2015-11-10 10:37 ` Benjamin Herrenschmidt
2015-11-10 10:37 ` Benjamin Herrenschmidt
2015-11-10 10:37 ` Benjamin Herrenschmidt
2015-11-10 12:43 ` Michael S. Tsirkin
2015-11-10 12:43 ` Michael S. Tsirkin
2015-11-10 12:43 ` Michael S. Tsirkin
2015-11-10 19:37 ` Benjamin Herrenschmidt [this message]
2015-11-10 19:37 ` Benjamin Herrenschmidt
2015-11-10 19:37 ` Benjamin Herrenschmidt
2015-11-10 12:43 ` Michael S. Tsirkin
2015-11-10 18:54 ` Andy Lutomirski
2015-11-10 18:54 ` Andy Lutomirski
2015-11-10 18:54 ` Andy Lutomirski
2015-11-10 22:27 ` Benjamin Herrenschmidt
2015-11-10 22:27 ` Benjamin Herrenschmidt
2015-11-10 22:27 ` Benjamin Herrenschmidt
2015-11-10 23:44 ` Andy Lutomirski
2015-11-10 23:44 ` Andy Lutomirski
2015-11-10 23:44 ` Andy Lutomirski
2015-11-11 0:44 ` Benjamin Herrenschmidt
2015-11-11 0:44 ` Benjamin Herrenschmidt
2015-11-11 0:44 ` Benjamin Herrenschmidt
2015-11-11 4:46 ` Andy Lutomirski
2015-11-11 4:46 ` Andy Lutomirski
2015-11-11 4:46 ` Andy Lutomirski
2015-11-11 5:08 ` Benjamin Herrenschmidt
2015-11-11 5:08 ` Benjamin Herrenschmidt
2015-11-11 5:08 ` Benjamin Herrenschmidt
2015-11-10 7:28 ` Jan Kiszka
2015-11-10 7:28 ` Jan Kiszka
2015-11-10 7:28 ` Jan Kiszka
2015-11-10 7:28 ` Jan Kiszka
2015-11-10 9:45 ` Knut Omang
2015-11-10 9:45 ` Knut Omang
2015-11-10 9:45 ` Knut Omang
2015-11-10 10:26 ` Benjamin Herrenschmidt
2015-11-10 10:26 ` Benjamin Herrenschmidt
2015-11-10 10:26 ` Benjamin Herrenschmidt
2015-11-10 10:27 ` Joerg Roedel
2015-11-10 10:27 ` Joerg Roedel
2015-11-10 10:27 ` Joerg Roedel
2015-11-10 19:36 ` Benjamin Herrenschmidt
2015-11-10 19:36 ` Benjamin Herrenschmidt
2015-11-10 19:36 ` Benjamin Herrenschmidt
-- strict thread matches above, loose matches on Subject: below --
2015-10-30 1:09 Andy Lutomirski
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=1447184258.31884.91.camel@kernel.crashing.org \
--to=benh@kernel.crashing.org \
--cc=borntraeger@de.ibm.com \
--cc=cornelia.huck@de.ibm.com \
--cc=davem@davemloft.net \
--cc=dwmw2@infradead.org \
--cc=hch@lst.de \
--cc=jroedel@suse.de \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=luto@amacapital.net \
--cc=luto@kernel.org \
--cc=mst@redhat.com \
--cc=pbonzini@redhat.com \
--cc=schwidefsky@de.ibm.com \
--cc=sebott@linux.vnet.ibm.com \
--cc=sparclinux@vger.kernel.org \
--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.