linux-kernel - Re: Abysmal HDD/USB write speed after sleep on a UEFI system

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Date:	Wed, 8 May 2013 10:54:44 +0200
From:	Patrik Jakobsson <patrik.r.jakobsson@...il.com>
To:	"Artem S. Tashkinov" <t.artem@...os.com>
Cc:	bhelgaas@...gle.com, hancockrwd@...il.com,
	stern@...land.harvard.edu, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	rjw@...k.pl, psusi@...ntu.com
Subject: Re: Abysmal HDD/USB write speed after sleep on a UEFI system

On Wed, May 8, 2013 at 10:37 AM, Artem S. Tashkinov <t.artem@...os.com> wrote:
>>I think this is the official statement from Intel on the SATA issue:
>>http://newsroom.intel.com/community/intel_newsroom/blog/2011/01/31/intel-identifies-chipset-design-error-implementing-solution
>
> My motherboard has a new fixed B3 revision so this issue doesn't affect me.
> Besides this SATA ports degradation issue is constantly present - it has no
> relationship to suspend.

Yes, Rev. B3 should be fine.

>>And here's a link to a discussion about the PCIe-to-PCI bridge stuff:
>>https://lkml.org/lkml/2012/1/30/216
>>
>>> Artem's system has a PCIe-to-PCI bridge (not a PCI-to-PCIe bridge) at
>>> 05:00.0, but it leads to [bus 06] and there's nothing on bus 06, so I
>>> don't think that's the problem.
>>
>>I meant what you said ;) and yes, it seems unrelated. Both my P8H67 and a
>>P8P67 I've built behave nicely if nothing is connected.
>
> Have you tried suspending more than three times? In the absence of UEFI
> boot this bug emerges only on a third or even fourth resume attempt. UEFI
> boot triggers it immediately on a first resume though.

I haven't enabled UEFI boot but did ~10 suspend/resume cycles with no issues.
I'm on 3.9-rc5 if that makes a difference. I'll do some more testing with
various kernel versions to see if I can trigger it.

-Patrik
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