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Date:   Wed, 1 Jun 2022 19:57:43 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Nathan Chancellor <nathan@kernel.org>
Cc:     Christoph Hellwig <hch@lst.de>, iommu@lists.linux-foundation.org,
        x86@kernel.org, Anshuman Khandual <anshuman.khandual@arm.com>,
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Subject: Re: [PATCH 09/15] swiotlb: make the swiotlb_init interface more
 useful
Message-ID: <20220601175743.GA28082@lst.de>
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On Wed, Jun 01, 2022 at 10:46:54AM -0700, Nathan Chancellor wrote:
> On Wed, Jun 01, 2022 at 07:34:41PM +0200, Christoph Hellwig wrote:
> > Can you send me the full dmesg and the content of
> > /sys/kernel/debug/swiotlb/io_tlb_nslabs for a good and a bad boot?
> 
> Sure thing, they are attached! If there is anything else I can provide
> or test, I am more than happy to do so.

Nothing interesting.  But the performance numbers almost look like
swiotlb=force got ignored before (even if I can't explain why).
Do you get a similar performance with the new kernel without
swiotlb=force as the old one with that argument by any chance?