From: ebiederm@xmission.com (Eric W. Biederman)
To: David Miller <davem@davemloft.net>
Cc: benh@kernel.crashing.org, suresh.b.siddha@intel.com,
matthew@wil.cx, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org, grundler@parisc-linux.org,
mingo@elte.hu, tglx@linutronix.de, jgarzik@pobox.com,
linux-ide@vger.kernel.org, jbarnes@virtuousgeek.org,
rdunlap@xenotime.net, mtk.manpages@gmail.com
Subject: Re: Multiple MSI, take 3
Date: Sun, 13 Jul 2008 19:03:52 -0700 [thread overview]
Message-ID: <m1ej5x1at3.fsf@frodo.ebiederm.org> (raw)
In-Reply-To: <20080713.174457.82768245.davem@davemloft.net> (David Miller's message of "Sun, 13 Jul 2008 17:44:57 -0700 (PDT)")
David Miller <davem@davemloft.net> writes:
> The x86 system designers decided to implement multi-MSI in an
> inconvenient way, it is not a "crap hardware design", merely
> some (unfortunately common) implementations of it happen to be.
To be clear I was referring to the PCI spec that describes multi-MSI
as a crap hardware design.
At the very least you are left with the problem of allocating multiple
contiguous destinations. Which has the potential to create
fragmentation on all supported platforms.
Optional mask bits are also nasty.
My honest opinion is that the should have deprecated multi-msi after the
introduction of the msi-x specification.
Eric
next prev parent reply other threads:[~2008-07-14 2:03 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-11 0:57 Multiple MSI, take 3 Matthew Wilcox
2008-07-11 0:59 ` [PATCH] PCI MSI: Replace 'type' with 'is_msix' Matthew Wilcox
2008-07-11 0:59 ` [PATCH] PCI: Add support for multiple MSI Matthew Wilcox
2008-07-11 8:28 ` Hidetoshi Seto
2008-07-11 9:45 ` Matthew Wilcox
2008-07-12 3:45 ` Benjamin Herrenschmidt
2008-07-11 1:00 ` [PATCH] Rewrite MSI-HOWTO Matthew Wilcox
2008-09-26 6:42 ` Grant Grundler
2008-07-11 1:00 ` [PATCH] AHCI: Request multiple MSIs Matthew Wilcox
2008-07-11 1:00 ` [PATCH] x86-64: Support for " Matthew Wilcox
2008-07-11 4:50 ` Kenji Kaneshige
2008-07-11 8:50 ` Matthew Wilcox
2008-07-14 1:08 ` Kenji Kaneshige
2008-07-11 10:06 ` Multiple MSI, take 3 Eric W. Biederman
2008-07-11 10:23 ` Matthew Wilcox
2008-07-11 10:32 ` David Miller
2008-07-11 10:41 ` Matthew Wilcox
2008-07-11 11:05 ` Eric W. Biederman
2008-07-11 11:34 ` Eric W. Biederman
2008-07-11 12:17 ` Matthew Wilcox
2008-07-11 15:10 ` Matthew Wilcox
2008-07-11 21:59 ` Suresh Siddha
2008-07-11 22:59 ` Eric W. Biederman
2008-07-11 23:15 ` Suresh Siddha
2008-07-11 23:59 ` Eric W. Biederman
2008-07-12 3:52 ` Benjamin Herrenschmidt
2008-07-12 4:41 ` Eric W. Biederman
2008-07-12 7:36 ` Benjamin Herrenschmidt
2008-07-13 22:30 ` Eric W. Biederman
2008-07-13 22:44 ` Benjamin Herrenschmidt
2008-07-13 23:29 ` Eric W. Biederman
2008-07-14 0:17 ` Benjamin Herrenschmidt
2008-07-14 0:44 ` David Miller
2008-07-14 2:03 ` Eric W. Biederman [this message]
2008-07-14 3:19 ` David Miller
2008-09-26 5:30 ` Jike Song
2008-09-27 19:04 ` Matthew Wilcox
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