From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: Yuanhan Liu <yuanhan.liu@linux.intel.com>, dev@dpdk.org
Cc: stable@dpdk.org
Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH 2/3] vhost: fix long stall of vhost-user negotiation
Date: Mon, 23 Jan 2017 09:25:47 +0100 [thread overview]
Message-ID: <a53560c7-4dff-ce47-1150-d06d9a0a09be@redhat.com> (raw)
In-Reply-To: <1485074820-8956-3-git-send-email-yuanhan.liu@linux.intel.com>
On 01/22/2017 09:46 AM, Yuanhan Liu wrote:
> Setting up the mapping from GPA (guest physical address) to HPA (guest
> physical address) could be very time consuming when the guest memory is
> backened with small pages (4K). The bigger the guest memory, the longer
> it takes. This could lead a very long vhost-user negotiation.
>
> Since the mapping is only needed in zero copy mode so far, we could
> avoid such time consuming settup when zero copy is turned off (which is
> the default case).
>
> It's actually a workaround, a right fix might be to start a new thread,
> and hide the big latency there.
>
> Fixes: e246896178e6 ("vhost: get guest/host physical address mappings")
>
> Cc: stable@dpdk.org
> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
> ---
> lib/librte_vhost/vhost_user.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Thanks,
Maxime
next prev parent reply other threads:[~2017-01-23 8:25 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1485074820-8956-1-git-send-email-yuanhan.liu@linux.intel.com>
2017-01-22 8:46 ` [dpdk-stable] [PATCH 1/3] vhost: fix dead loop in enqueue path Yuanhan Liu
2017-01-23 7:56 ` [dpdk-stable] [dpdk-dev] " Maxime Coquelin
2017-01-22 8:46 ` [dpdk-stable] [PATCH 2/3] vhost: fix long stall of vhost-user negotiation Yuanhan Liu
2017-01-23 8:25 ` Maxime Coquelin [this message]
2017-01-22 8:47 ` [dpdk-stable] [PATCH 3/3] net/virtio: fix crash when number of virtio devices > 1 Yuanhan Liu
2017-01-23 7:58 ` [dpdk-stable] [dpdk-dev] " Maxime Coquelin
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