linux-kernel - RE: [git patches] libata fixes

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Date:	Sun, 11 Mar 2007 12:35:46 +0100
From:	"Paul Rolland" <rol@...917.net>
To:	"'Tejun Heo'" <htejun@...il.com>
Cc:	"'Jeff Garzik'" <jeff@...zik.org>,
	"'Andrew Morton'" <akpm@...ux-foundation.org>,
	"'Linus Torvalds'" <torvalds@...ux-foundation.org>,
	<linux-ide@...r.kernel.org>,
	"'LKML'" <linux-kernel@...r.kernel.org>,
	"'Eric D. Mudama'" <edmudama@...il.com>
Subject: RE: [git patches] libata fixes

Hello,

> It seems like IRQ is not getting through.  The first IRQ 
> driven command is failing for you.

Hmmmm.... 
> Extract is :
> ata7: PATA max UDMA/100 cmd 0x0000000000019c00 ctl 0x0000000000019882 bmdma
> 0x0000000000019400 irq 16
> ata8: PATA max UDMA/100 cmd 0x0000000000019800 ctl 0x0000000000019482 bmdma
> 0x0000000000019408 irq 16

IRQ 16 is IO-APIC-fasteoi for libata, and is not shared... but all the
others libata IRQ are IO-APIC-edge.

> * Does giving 'acpi=off' or 'irqpoll' make any difference?
> 
> * Can you connect a harddisk to the channel and see whether 
> that works?
Tried that.. Disk is identified as ATA-7: Mastor 6Y080L0, YAR41BW0, max
UDMA/13
and then timeout again...

Tried then with acpi=off, same result (identify is OK, but then timeout),
and irqpoll and then it was OK !!!!

Let's then go back to my DVD-RW and test irqpoll...
and ... Yes.... Got it !
It is identified, it can be mounted, and read as /dev/sr1 !

/proc/interrupts show a count of 0 for IRQ 16, so yes, it goes somewhere
else...

Doing some diffs on copy of /proc/interrupts while accessing the DVD
gives two possibilities : IRQ14 or IRQ18, but both are also counting
when not accessing the DVD...

Question : does running with irqpoll affects performance ?

Paul

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