From: Dongli Zhang <dongli.zhang@oracle.com>
To: luferry <luferry@163.com>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
Ming Lei <ming.lei@redhat.com>,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] make blk_mq_map_queues more friendly for cpu topology
Date: Wed, 27 Mar 2019 17:39:16 +0800 [thread overview]
Message-ID: <8e02b730-b504-50a2-64e6-72817b07e93d@oracle.com> (raw)
In-Reply-To: <764f3c.12445.169be70834b.Coremail.luferry@163.com>
On 03/27/2019 05:17 PM, luferry wrote:
>
>
>
> Actually, I just bought one vm from public cloud provider and run into this problem.
> after reading code and compare pci device info, I reproduce this scenario.
There is lack of vector issue when number of queues is more than maxcpus as well.
https://lore.kernel.org/lkml/e4afe4c5-0262-4500-aeec-60f30734b4fc@default
I was going to send out patch to fix that specific case on virtio side.
BTW, is your VM's virtio mmio based or pci based?
As mentioned in previous email, when I was playing with firecracker by amazon,
the virtio-blk is mmio based. Not sure if that would lead to the lack of vector
issue.
Dongli Zhang
next prev parent reply other threads:[~2019-03-27 9:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-25 15:26 luferry
2019-03-26 7:39 ` Christoph Hellwig
2019-03-26 7:55 ` luferry
2019-03-27 8:16 ` Christoph Hellwig
2019-03-27 9:17 ` luferry
2019-03-27 9:39 ` Dongli Zhang [this message]
2019-03-27 9:53 ` luferry
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