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From: Joerg Roedel <joro@8bytes.org>
To: Dmitry Safonov <dima@arista.com>
Cc: linux-kernel@vger.kernel.org, 0x7f454c46@gmail.com,
	Alex Williamson <alex.williamson@redhat.com>,
	David Woodhouse <dwmw2@infradead.org>,
	Ingo Molnar <mingo@kernel.org>,
	Lu Baolu <baolu.lu@linux.intel.com>,
	iommu@lists.linux-foundation.org
Subject: Re: [PATCHv3] iommu/intel: Ratelimit each dmar fault printing
Date: Thu, 29 Mar 2018 10:50:18 +0200	[thread overview]
Message-ID: <20180329085017.tkdtx77u4khiuqhw@8bytes.org> (raw)
In-Reply-To: <1521579013.2686.83.camel@arista.com>

On Tue, Mar 20, 2018 at 08:50:13PM +0000, Dmitry Safonov wrote:
> Hmm, but this fixes my softlockup issue, because it's about time spent
> in printk() inside irq-disabled section, rather about exiting the dmar-
> clearing loop.
> And on my hw doesn't make any difference to limit loop or not because
> clearing a fault is much faster than hw could generate a new fault.
> ITOW, it fixes the softlockup for me and the loop-related lockup can't
> happen on hw I have (so it's the other issue, [possible?] on other hw).

It might solve your issue, but someone else might still run into it with
a different setup. An upstream fix needs to solve it for everyone.

Thanks,

	Joerg

  reply	other threads:[~2018-03-29  8:50 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-15 19:17 Dmitry Safonov
2018-03-05 15:00 ` Dmitry Safonov
2018-03-13 16:21   ` Dmitry Safonov
2018-03-15 13:46 ` Joerg Roedel
2018-03-15 14:13   ` Dmitry Safonov
2018-03-15 14:22     ` Joerg Roedel
2018-03-15 14:34       ` Dmitry Safonov
2018-03-15 14:42         ` Dmitry Safonov
2018-03-15 15:28           ` Joerg Roedel
2018-03-15 15:54             ` Dmitry Safonov
2018-03-20 20:50             ` Dmitry Safonov
2018-03-29  8:50               ` Joerg Roedel [this message]
2018-03-29 13:52                 ` Dmitry Safonov

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