linux-kernel - Re:Re: [PATCH] make blk_mq_map_queues more friendly for cpu topology

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Date:   Wed, 27 Mar 2019 17:53:49 +0800 (CST)
From:   luferry <luferry@....com>
To:     "Dongli Zhang" <dongli.zhang@...cle.com>
Cc:     "Christoph Hellwig" <hch@....de>, "Jens Axboe" <axboe@...nel.dk>,
        "Ming Lei" <ming.lei@...hat.com>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re:Re: [PATCH] make blk_mq_map_queues more friendly for cpu
 topology


>
>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

It's pci based.