linux-kernel - Re: [PATCH 0/4] AHCI: Conserve interrupts with pci_enable_msi_block

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Message-ID: <20130904123238.GC8726@dhcp-26-207.brq.redhat.com>
Date:	Wed, 4 Sep 2013 14:32:39 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-pci@...r.kernel.org, linux-ide@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>, Joerg Roedel <joro@...tes.org>,
	Jan Beulich <JBeulich@...e.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH 0/4] AHCI: Conserve interrupts with
 pci_enable_msi_block_part() interface

On Tue, Sep 03, 2013 at 10:09:54AM -0400, Tejun Heo wrote:
> On Tue, Sep 03, 2013 at 09:55:41AM -0400, Tejun Heo wrote:
> > Hmmm.... I've been looking at the code and and a curiosity.  Why does
> > multiple MSI support implicitly enabled threaded IRQ handling?  Why
> > are those two linked?  Also, do you have any numbers to show that this
> > actually is better?  Handling the processing off to a thread isn't a
> > light operation.
> 
> Also, it probably is a good idea to skip dummy ports when requesting
> irqs from ahci_host_activate(), which BTW should probably be renamed
> to ahci_host_activate_mmsi().

Hmm.. that is actually a great idea. What I am not sure about whether is
a dummy port still can send (spurious?) interrupts? The hardware interrupt
handler would have to be reworked then. Seems as a yet another topic to me ;)

> -- 
> tejun

-- 
Regards,
Alexander Gordeev
agordeev@...hat.com
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