From: Juan Quintela <quintela@redhat.com>
To: Li Zhijian <lizhijian@cn.fujitsu.com>
Cc: peter.maydell@linaro.org, dgilbert@redhat.com, qemu-devel@nongnu.org
Subject: Re: [PATCH v3 2/2] migration/rdma: advise prefetch write for ODP region
Date: Thu, 07 Oct 2021 14:05:35 +0200 [thread overview]
Message-ID: <87o881doq8.fsf@secure.mitica> (raw)
In-Reply-To: <20210910070255.509349-3-lizhijian@cn.fujitsu.com> (Li Zhijian's message of "Fri, 10 Sep 2021 15:02:55 +0800")
Li Zhijian <lizhijian@cn.fujitsu.com> wrote:
> The responder mr registering with ODP will sent RNR NAK back to
> the requester in the face of the page fault.
> ---------
> ibv_poll_cq wc.status=13 RNR retry counter exceeded!
> ibv_poll_cq wrid=WRITE RDMA!
> ---------
> ibv_advise_mr(3) helps to make pages present before the actual IO is
> conducted so that the responder does page fault as little as possible.
>
> Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
> Reviewed-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
>
> ---
> V3: Fix FreeBSD compiling errors
> V2: use IBV_ADVISE_MR_FLAG_FLUSH instead of IB_UVERBS_ADVISE_MR_FLAG_FLUSH
> and add Reviewed-by tag. # Marcel
> ---
> meson.build | 6 ++++++
> migration/rdma.c | 42 ++++++++++++++++++++++++++++++++++++++++++
> migration/trace-events | 1 +
> 3 files changed, 49 insertions(+)
Reviewed-by: Juan Quintela <quintela@redhat.com>
prev parent reply other threads:[~2021-10-07 12:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-10 7:02 [PATCH v3 0/2] enable fsdax rdma migration Li Zhijian
2021-09-10 7:02 ` [PATCH v3 1/2] migration/rdma: Try to register On-Demand Paging memory region Li Zhijian
2021-10-07 12:05 ` Juan Quintela
2021-09-10 7:02 ` [PATCH v3 2/2] migration/rdma: advise prefetch write for ODP region Li Zhijian
2021-10-07 12:05 ` Juan Quintela [this message]
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