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

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Message-ID: <20130903140954.GC10522@htj.dyndns.org>
Date:	Tue, 3 Sep 2013 10:09:54 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Alexander Gordeev <agordeev@...hat.com>
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 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().

Thanks.

-- 
tejun
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