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Date:   Sat, 11 Aug 2018 19:39:56 +0200
From:   Oleksandr Natalenko <>
To:     Ming Lei <>
Cc:     Ming Lei <>, Omar Sandoval <>,
        "Martin K. Petersen" <>,
        Christoph Hellwig <>,
        Paolo Bonzini <>,
        Hannes Reinecke <>, Jens Axboe <>,
        Linux SCSI List <>,
        linux-block <>,
        Linux Kernel Mailing List <>,
        Greg Kurz <>,,
        qemu-devel <>
Subject: Re: Slow boot in QEMU with virtio-scsi disks


On 11.08.2018 14:23, Ming Lei wrote:
> Please test for-4.19/block:
> This slow boot issue should have been fixed by the following commits:
> 1311326cf475 blk-mq: avoid to synchronize rcu inside 
> blk_cleanup_queue()
> 97889f9ac24f blk-mq: remove synchronize_rcu() from 
> blk_mq_del_queue_tag_set()
> 5815839b3ca1 blk-mq: introduce new lock for protecting 
> hctx->dispatch_wait
> 2278d69f030f blk-mq: don't pass **hctx to blk_mq_mark_tag_wait()
> 8ab6bb9ee8d0 blk-mq: cleanup blk_mq_get_driver_tag()

Indeed, I can confirm that these commits fix the issue.

Thanks a lot.

   Oleksandr Natalenko (post-factum)

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