From: Christoph Hellwig <hch@infradead.org>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Daniel Verkamp <dverkamp@chromium.org>,
Jens Axboe <axboe@kernel.dk>,
"Michael S. Tsirkin" <mst@redhat.com>,
virtualization@lists.linux-foundation.org,
linux-block@vger.kernel.org,
Stefan Hajnoczi <stefanha@redhat.com>,
Changpeng Liu <changpeng.liu@intel.com>
Subject: Re: [PATCH v8] virtio_blk: add discard and write zeroes support
Date: Fri, 26 Oct 2018 01:26:40 -0700 [thread overview]
Message-ID: <20181026082640.GA1147@infradead.org> (raw)
In-Reply-To: <486afcff-a8bd-a05b-e331-e395d4d14853@redhat.com>
On Fri, Oct 26, 2018 at 01:28:54AM +0200, Paolo Bonzini wrote:
> On 15/10/2018 11:27, Christoph Hellwig wrote:
> > There is some issues in this spec. For one using the multiple ranges
> > also for write zeroes is rather inefficient. Write zeroes really should
> > use the same format as read and write.
>
> What makes it inefficient?
We require a memory allocation for each write zeroes instead of encoding
the lba/len in the command.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>,
"Michael S. Tsirkin" <mst@redhat.com>,
virtualization@lists.linux-foundation.org,
Christoph Hellwig <hch@infradead.org>,
linux-block@vger.kernel.org,
Stefan Hajnoczi <stefanha@redhat.com>,
Changpeng Liu <changpeng.liu@intel.com>
Subject: Re: [PATCH v8] virtio_blk: add discard and write zeroes support
Date: Fri, 26 Oct 2018 01:26:40 -0700 [thread overview]
Message-ID: <20181026082640.GA1147@infradead.org> (raw)
In-Reply-To: <486afcff-a8bd-a05b-e331-e395d4d14853@redhat.com>
On Fri, Oct 26, 2018 at 01:28:54AM +0200, Paolo Bonzini wrote:
> On 15/10/2018 11:27, Christoph Hellwig wrote:
> > There is some issues in this spec. For one using the multiple ranges
> > also for write zeroes is rather inefficient. Write zeroes really should
> > use the same format as read and write.
>
> What makes it inefficient?
We require a memory allocation for each write zeroes instead of encoding
the lba/len in the command.
next prev parent reply other threads:[~2018-10-26 8:26 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-06 4:19 [PATCH v6] virtio_blk: add DISCARD and WRIET ZEROES commands support Changpeng Liu
2018-06-07 13:10 ` Stefan Hajnoczi
2018-06-07 23:07 ` Liu, Changpeng
2018-06-08 10:20 ` Stefan Hajnoczi
2018-06-11 3:37 ` Liu, Changpeng
2018-06-12 16:05 ` Stefan Hajnoczi
2018-08-28 22:25 ` [PATCH v7] virtio_blk: add discard and write zeroes support Daniel Verkamp
2018-10-12 21:06 ` [PATCH v8] " Daniel Verkamp
2018-10-12 21:06 ` Daniel Verkamp
2018-10-15 0:54 ` Michael S. Tsirkin
2018-10-15 0:54 ` Michael S. Tsirkin
2018-10-15 9:21 ` Ming Lei
2018-10-15 9:27 ` Christoph Hellwig
2018-10-15 9:27 ` Christoph Hellwig
2018-10-15 23:16 ` Daniel Verkamp
2018-10-15 23:16 ` Daniel Verkamp
2018-10-16 1:45 ` Liu, Changpeng
2018-10-16 1:45 ` Liu, Changpeng
2018-10-16 1:40 ` Liu, Changpeng
2018-10-16 1:40 ` Liu, Changpeng
2018-10-25 23:28 ` Paolo Bonzini
2018-10-25 23:28 ` Paolo Bonzini
2018-10-26 8:26 ` Christoph Hellwig [this message]
2018-10-26 8:26 ` Christoph Hellwig
2018-10-29 3:21 ` Liu, Changpeng
2018-10-29 3:21 ` Liu, Changpeng
2018-10-29 18:03 ` Paolo Bonzini
2018-10-29 18:03 ` Paolo Bonzini
2018-10-26 8:08 ` Stefan Hajnoczi
2018-10-26 8:08 ` Stefan Hajnoczi
2018-10-26 14:47 ` Michael S. Tsirkin
2018-10-26 14:47 ` Michael S. Tsirkin
2018-10-29 5:05 ` Stefan Hajnoczi
2018-10-29 5:05 ` Stefan Hajnoczi
2018-11-01 21:25 ` Michael S. Tsirkin
2018-11-01 21:25 ` Michael S. Tsirkin
2018-11-01 22:18 ` Daniel Verkamp
2018-11-01 22:18 ` Daniel Verkamp
2018-11-01 22:40 ` [PATCH v9] " Daniel Verkamp
2018-11-01 22:40 ` Daniel Verkamp
2018-11-01 23:43 ` Dongli Zhang
2018-11-01 23:43 ` Dongli Zhang
2018-11-02 18:25 ` Daniel Verkamp
2018-11-02 18:25 ` Daniel Verkamp
2018-11-02 4:17 ` Stefan Hajnoczi
2018-11-02 4:17 ` Stefan Hajnoczi
2018-12-05 9:46 ` Liu, Changpeng
2018-12-05 9:46 ` Liu, Changpeng
2018-12-05 13:41 ` Michael S. Tsirkin
2018-12-05 13:41 ` Michael S. Tsirkin
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