From: Max Gurtovoy <mgurtovoy@nvidia.com>
To: Christoph Hellwig <hch@infradead.org>,
Chuck Lever III <chuck.lever@oracle.com>
Cc: linux-rdma <linux-rdma@vger.kernel.org>,
"Kornievskaia, Olga" <Olga.Kornievskaia@netapp.com>
Subject: Re: IB_MR_TYPE_SG_GAPS support
Date: Sun, 29 Aug 2021 16:46:52 +0300 [thread overview]
Message-ID: <e271256b-0276-eba0-ede9-ecebf8bb56ce@nvidia.com> (raw)
In-Reply-To: <YSiF6iER1CXmjit1@infradead.org>
On 8/27/2021 9:27 AM, Christoph Hellwig wrote:
> On Thu, Aug 26, 2021 at 05:26:11PM +0000, Chuck Lever III wrote:
>> Hi-
>>
>> I have a report that net/sunrpc/xprtrdma/frwr_ops.c::frwr_map()
>> is attempting to register a mix of GPU and CPU pages with a
>> single MR during an NFSv4 READ.
> What GPU pages?
I guess it's GPU device memory.
But as Jason mentioned, This is still not supported in RDMA. So there
should be a bounce buffer in the IO path between GPU and CPU memory
subsystems.
next prev parent reply other threads:[~2021-08-29 13:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-26 17:26 IB_MR_TYPE_SG_GAPS support Chuck Lever III
2021-08-26 23:45 ` Jason Gunthorpe
2021-08-27 6:27 ` Christoph Hellwig
2021-08-29 13:46 ` Max Gurtovoy [this message]
2021-08-30 8:29 ` Christoph Hellwig
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