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From: "Thomas Hellström (VMware)" <thomas_os@shipmail.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: dma api errors with swiotlb
Date: Wed, 4 Sep 2019 14:54:26 +0200	[thread overview]
Message-ID: <4e21951d-025a-2b3d-14c8-878c6f237525@shipmail.org> (raw)
In-Reply-To: <20190904121722.GA15601@infradead.org>

On 9/4/19 2:17 PM, Christoph Hellwig wrote:
> A call to dma_max_mapping_size() to limit the maximum I/O size solves
> that problem.  With the latest kernel that should actually be done
> automatically by the SCSI midlayer for you.

Hmm, OK. I guess with a sufficient queue depth and many mappings waiting 
for DMA completion, the SWIOTLB may fill up anyway...

I'll see if I can come up with something.

Thanks,

Thomas



  reply	other threads:[~2019-09-04 12:54 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-04  7:59 dma api errors with swiotlb Thomas Hellström (VMware)
2019-09-04 12:17 ` Christoph Hellwig
2019-09-04 12:54   ` Thomas Hellström (VMware) [this message]
2019-09-04 12:55     ` Christoph Hellwig
2019-09-04 13:02       ` Thomas Hellström (VMware)
2019-09-04 13:16         ` Christoph Hellwig
2019-09-04 13:21           ` Thomas Hellström (VMware)

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