linux-kernel - Re: Slow boot in QEMU with virtio-scsi disks

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Message-ID: <20180822121523.4494871d@bahia.lan>
Date:   Wed, 22 Aug 2018 12:15:23 +0200
From:   Greg Kurz <groug@...d.org>
To:     Oleksandr Natalenko <oleksandr@...alenko.name>
Cc:     Ming Lei <tom.leiming@...il.com>, Ming Lei <ming.lei@...hat.com>,
        Omar Sandoval <osandov@...com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Christoph Hellwig <hch@....de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Hannes Reinecke <hare@...e.de>, Jens Axboe <axboe@...nel.dk>,
        Linux SCSI List <linux-scsi@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        qemu-discuss@...gnu.org, qemu-devel <qemu-devel@...gnu.org>
Subject: Re: Slow boot in QEMU with virtio-scsi disks

On Sat, 11 Aug 2018 19:39:56 +0200
Oleksandr Natalenko <oleksandr@...alenko.name> wrote:

> Hi.
> 
> On 11.08.2018 14:23, Ming Lei wrote:
> > Please test for-4.19/block:
> > 
> > https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/log/?h=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.
> 

So do I.

Thanks Ming Lei for the fix !

Cheers,

--
Greg