From: Mark Lord <kernel@start.ca>
To: Alexander Gordeev <agordeev@redhat.com>,
David Laight <David.Laight@ACULAB.COM>
Cc: Tejun Heo <tj@kernel.org>,
linux-kernel@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
Michael Ellerman <michael@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Ben Hutchings <bhutchings@solarflare.com>,
"H. Peter Anvin" <hpa@zytor.com>,
linux-pci@vger.kernel.org
Subject: Re: [PATCH RFC v2 12/29] PCI/MSI: Introduce pcim_enable_msi*() family helpers
Date: Mon, 28 Oct 2013 12:30:48 -0400 [thread overview]
Message-ID: <526E9138.9090503@start.ca> (raw)
In-Reply-To: <20131025100103.GA317@dhcp-26-207.brq.redhat.com>
On 13-10-25 06:01 AM, Alexander Gordeev wrote:
>
> If this problem really exists anywhere besides pSeries?
>
> I can imagine x86 hitting lack of vectors in interrupt table when
> number of CPUs exceeds hundreds, but do we have this problem now?
An awful lot of x86 hardware has a 256 (255?) vector limit for MSI/MSI-X.
Couple that with PCIe Virtual Functions, each wanting 16 vectors (for example),
and that limit is really simple to exceed today.
But this is more a problem for a sysadmin, and I am happy with the current
and the proposed methods.
Cheers
next prev parent reply other threads:[~2013-10-28 16:31 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-18 17:12 [PATCH RFC v2 00/29] Introduce pcim_enable_msi*() family helpers Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 01/29] PCI/MSI/s390: Fix single MSI only check Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 02/29] PCI/MSI/s390: Remove superfluous check of MSI type Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 03/29] PCI/MSI/pSeries: Fix wrong error code reporting Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 04/29] PCI/MSI/pSeries: Make quota traversing and requesting race-safe Alexander Gordeev
2013-11-20 15:43 ` Tejun Heo
2013-10-18 17:12 ` [PATCH RFC v2 05/29] PCI/MSI: Fix return value when populate_msi_sysfs() failed Alexander Gordeev
2013-11-20 15:50 ` Tejun Heo
2013-10-18 17:12 ` [PATCH RFC v2 06/29] PCI/MSI: Get rid of useless count of msi_desc leftovers Alexander Gordeev
2013-11-20 16:07 ` Tejun Heo
2013-11-22 18:27 ` Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 07/29] PCI/MSI: Return -ENOSYS for unimplemented interfaces, not -1 Alexander Gordeev
2013-11-20 16:07 ` Tejun Heo
2013-10-18 17:12 ` [PATCH RFC v2 08/29] PCI/MSI: Make pci_enable_msix() 'nvec' argument unsigned int Alexander Gordeev
2013-11-20 16:14 ` Tejun Heo
2013-11-22 18:34 ` Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 09/29] PCI/MSI: Factor out pci_get_msi_cap() interface Alexander Gordeev
2013-11-20 16:18 ` Tejun Heo
2013-11-25 13:49 ` Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 10/29] PCI/MSI: Get rid of pci_enable_msi_block_auto() interface Alexander Gordeev
2013-11-20 16:21 ` Tejun Heo
2013-10-18 17:12 ` [PATCH RFC v2 11/29] PCI/MSI: Convert pci_msix_table_size() to a public interface Alexander Gordeev
2013-11-20 16:23 ` Tejun Heo
2013-11-22 18:38 ` Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 12/29] PCI/MSI: Introduce pcim_enable_msi*() family helpers Alexander Gordeev
2013-10-24 10:51 ` Tejun Heo
2013-10-24 10:57 ` David Laight
2013-10-24 11:01 ` Tejun Heo
2013-10-24 11:41 ` Alexander Gordeev
2013-10-25 2:22 ` Mark Lord
2013-10-25 9:10 ` David Laight
2013-10-25 9:10 ` David Laight
2013-10-25 10:01 ` Alexander Gordeev
2013-10-25 14:52 ` intel e1000e pci driver issue on RT Linux kernel Karicheri, Muralidharan
2013-10-25 14:59 ` Karicheri, Muralidharan
2013-10-27 22:27 ` [PATCH RFC v2 12/29] PCI/MSI: Introduce pcim_enable_msi*() family helpers Michael Ellerman
2013-10-28 16:30 ` Mark Lord [this message]
2013-10-24 14:31 ` Alexander Gordeev
2013-10-25 2:23 ` Mark Lord
2013-11-04 8:12 ` Alexander Gordeev
2013-11-20 17:15 ` Tejun Heo
2013-11-22 18:44 ` Alexander Gordeev
2013-11-22 18:44 ` Tejun Heo
2013-11-22 18:54 ` Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 13/29] ipr: Do not call pci_disable_msi/msix() if pci_enable_msi/msix() failed Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 14/29] ipr: Make use of pcim_enable_msi/msix() interfaces Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 15/29] ixgbe: Make use of pcim_enable_msix_range() interface Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 16/29] ixgbevf: " Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 17/29] megaraid: Make use of pcim_enable_msix() interface Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 18/29] ntb: Fix missed call to pci_enable_msix() Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 19/29] ntb: Make use of pcim_enable_msix/msix_exact() interfaces Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 20/29] qib: Make use of pcim_enable_msix() and pci_msix_table_size() interfaces Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 21/29] qla2xxx: Make use of pcim_enable_msix_range() interface Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 22/29] qlge: Get rid of an redundant assignment Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 23/29] qlge: Make use of pcim_enable_msix() interface Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 24/29] tg3: " Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 25/29] vmxnet3: Return -EINVAL if number of requested MSI-Xs is not enough Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 26/29] vmxnet3: Fixup a weird loop exit Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 27/29] vmxnet3: Return -ENOSPC when not enough MSI-X vectors available Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 28/29] vmxnet3: Limit number of rx queues to 1 if per-queue MSI-Xs failed Alexander Gordeev
2013-10-18 17:12 ` [PATCH RFC v2 29/29] vmxnet3: Make use of pcim_enable_msix_range() interface Alexander Gordeev
2013-10-21 8:51 ` David Laight
2013-10-21 10:19 ` Alexander Gordeev
2013-11-11 19:56 ` [PATCH RFC v2 00/29] Introduce pcim_enable_msi*() family helpers Alexander Gordeev
2013-11-20 17:16 ` Tejun Heo
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