From: Stefan Hajnoczi <stefanha@gmail.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 1/6] virtio: introduce virtio_map
Date: Tue, 27 Oct 2015 16:19:54 +0000 [thread overview]
Message-ID: <20151027161954.GG5626@stefanha-x1.localdomain> (raw)
In-Reply-To: <1445935663-31971-2-git-send-email-mst@redhat.com>
On Tue, Oct 27, 2015 at 10:47:56AM +0200, Michael S. Tsirkin wrote:
> This will still fail if there's no space left in the sg, but luckily max
> queue size in use is currently 256, while max sg size is 1024, so we
> should be OK even is all entries happen to cross a single DIMM boundary.
Don't forget about indirect descriptors. They can use all 1024 iovecs,
regardless of virtqueue size, so virtqueue size of 256 isn't the true
maximum.
I'm worried that we could now see failures due to non-contiguous HVAs.
next prev parent reply other threads:[~2015-10-27 16:20 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-27 8:47 [Qemu-devel] [PATCH 0/6] virtio: handle non contigious s/g entries Michael S. Tsirkin
2015-10-27 8:47 ` [Qemu-devel] [PATCH 1/6] virtio: introduce virtio_map Michael S. Tsirkin
2015-10-27 16:13 ` Stefan Hajnoczi
2015-10-27 18:38 ` Michael S. Tsirkin
2015-10-27 16:19 ` Stefan Hajnoczi [this message]
2015-10-27 18:34 ` Michael S. Tsirkin
2015-10-28 11:37 ` Stefan Hajnoczi
2015-10-28 12:16 ` Igor Mammedov
2015-10-28 13:11 ` Igor Mammedov
2015-10-27 8:47 ` [Qemu-devel] [PATCH 2/6] virtio: switch to virtio_map Michael S. Tsirkin
2015-10-28 13:02 ` Igor Mammedov
2015-10-27 8:48 ` [Qemu-devel] [PATCH 3/6] virtio-blk: convert to virtqueue_map Michael S. Tsirkin
2015-10-28 13:02 ` Igor Mammedov
2015-10-27 8:48 ` [Qemu-devel] [PATCH 4/6] virtio-serial: convert to virtio_map Michael S. Tsirkin
2015-10-28 13:03 ` Igor Mammedov
2015-10-27 8:48 ` [Qemu-devel] [PATCH 5/6] virtio-scsi: convert to virtqueue_map Michael S. Tsirkin
2015-10-28 13:03 ` Igor Mammedov
2015-10-27 8:48 ` [Qemu-devel] [PATCH 6/6] virtio: drop virtqueue_map_sg Michael S. Tsirkin
2015-10-28 13:04 ` Igor Mammedov
2015-10-27 8:50 ` [Qemu-devel] [PATCH 0/6] virtio: handle non contigious s/g entries Michael S. Tsirkin
2015-10-27 11:51 ` Michael S. Tsirkin
2015-10-27 16:24 ` Stefan Hajnoczi
2015-10-28 12:30 ` Igor Mammedov
2015-10-27 12:06 ` Cornelia Huck
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