All of lore.kernel.org
 help / color / mirror / Atom feed
From: Alex Williamson <alex.williamson@redhat.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: iommu@lists.linux-foundation.org, dwmw2@infradead.org,
	joro@8bytes.org, linux-pci@vger.kernel.org, ddutile@redhat.com
Subject: Re: [PATCH v2 1/2] iommu: Quirked PCIe bridge test and search function
Date: Tue, 28 May 2013 13:53:10 -0600	[thread overview]
Message-ID: <1369770790.2646.272.camel@ul30vt.home> (raw)
In-Reply-To: <20130528123827.2507c34e@nehalam.linuxnetplumber.net>

On Tue, 2013-05-28 at 12:38 -0700, Stephen Hemminger wrote:
> On Tue, 28 May 2013 12:40:20 -0600
> Alex Williamson <alex.williamson@redhat.com> wrote:
> 
> > Some PCIe-to-PCI bridges are not fully compliant with the PCIe spec
> > and do not include a PCIe capability.  pci_is_pcie() is not useful on
> > these devices, making it difficult to determine where we transition
> > from a legacy PCI bus to a PCIe link.  PCI-core doesn't want a quirked
> > bridge test for fear of confusion that a PCIe capability would be
> > expected, so implement it in IOMMU code.
> > 
> > Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
> 
> This won't work for me because I run without IOMMU.
> The overhead of IOMMU setup per-packet significantly impacts network performance.

You were one of the reporters of this issue:

http://www.spinics.net/lists/linux-pci/msg19579.html

Does this not work for you or are you saying this is not relevant to you
because you no longer attempt to enable the IOMMU?  Thanks,

Alex


  reply	other threads:[~2013-05-28 19:53 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-28 18:40 [PATCH v2 0/2] iommu/intel: Quirk non-compliant PCIe-to-PCI bridges Alex Williamson
2013-05-28 18:40 ` [PATCH v2 1/2] iommu: Quirked PCIe bridge test and search function Alex Williamson
2013-05-28 18:40   ` Alex Williamson
2013-05-28 19:38   ` Stephen Hemminger
2013-05-28 19:53     ` Alex Williamson [this message]
2013-05-28 19:56       ` Stephen Hemminger
2013-05-28 20:15         ` Alex Williamson
2013-05-28 20:28           ` Stephen Hemminger
2013-06-20 13:59   ` Joerg Roedel
2013-06-20 13:59     ` Joerg Roedel
2013-06-20 15:44     ` Alex Williamson
2013-06-20 16:15       ` Joerg Roedel
2013-06-20 16:15         ` Joerg Roedel
2013-06-26  4:20         ` Bjorn Helgaas
2013-06-26 18:45           ` Alex Williamson
2013-06-26 18:45             ` Alex Williamson
2013-06-26 19:11             ` Bjorn Helgaas
2013-05-28 18:40 ` [PATCH v2 2/2] intel-iommu: Convert to iommu_pci_find_upstream + iommu_pci_is_pcie_bridge Alex Williamson
2013-05-28 22:09 ` [PATCH v2 0/2] iommu/intel: Quirk non-compliant PCIe-to-PCI bridges Bjorn Helgaas
2013-05-28 22:09   ` Bjorn Helgaas
2013-05-28 22:53 ` [PATCH v2 3/2] pci: Remove unused pci_find_upstream_pcie_bridge() Alex Williamson
2013-05-28 22:53   ` Alex Williamson
2013-07-08 17:07 ` [PATCH v2 0/2] iommu/intel: Quirk non-compliant PCIe-to-PCI bridges Alex Williamson
2013-07-08 17:07   ` Alex Williamson
2013-07-08 19:34   ` Bjorn Helgaas
2013-07-08 19:34     ` Bjorn Helgaas
2013-07-08 20:49     ` Alex Williamson
2013-07-08 20:49       ` Alex Williamson
2013-07-08 21:51       ` Bjorn Helgaas
2013-07-09 18:27         ` Alex Williamson
2013-07-09 18:27           ` Alex Williamson
2013-07-09 20:10           ` Bjorn Helgaas
2013-07-30 11:52   ` Joerg Roedel
2013-07-30 11:52     ` Joerg Roedel

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=1369770790.2646.272.camel@ul30vt.home \
    --to=alex.williamson@redhat.com \
    --cc=ddutile@redhat.com \
    --cc=dwmw2@infradead.org \
    --cc=iommu@lists.linux-foundation.org \
    --cc=joro@8bytes.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=stephen@networkplumber.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.