From: "Michael S. Tsirkin" <mst@redhat.com>
To: Igor Mammedov <imammedo@redhat.com>
Cc: pbonzini@redhat.com, qemu-devel@nongnu.org, peter.maydell@linaro.org
Subject: Re: [Qemu-devel] [PATCH v4 0/7] Fix QEMU crash during memory hotplug with vhost=on
Date: Wed, 15 Jul 2015 19:32:31 +0300 [thread overview]
Message-ID: <20150715192933-mutt-send-email-mst@redhat.com> (raw)
In-Reply-To: <20150715171201.05f6bc0d@nial.brq.redhat.com>
On Wed, Jul 15, 2015 at 05:12:01PM +0200, Igor Mammedov wrote:
> On Thu, 9 Jul 2015 13:47:17 +0200
> Igor Mammedov <imammedo@redhat.com> wrote:
>
> there also is yet another issue with vhost-user. It also has
> very low limit on amount of memory regions (if I recall correctly 8)
> and it's possible to trigger even without memory hotplug.
> one just need to start QEMU with a several -numa memdev= options
> to create a necessary amount of memory regions to trigger it.
>
> lowrisk option to fix it would be increasing limit in vhost-user
> backend.
>
> another option is disabling vhost and fall-back to virtio,
> but I don't know much about vhost if it's possible to
> to switch it off without loosing packets guest was sending
> at the moment and if it will work at all with vhost.
With vhost-user you can't fall back to virtio: it's
not an accelerator, it's the backend.
Updating the protocol to support a bigger table
is possible but old remotes won't be able to support it.
--
MST
next prev parent reply other threads:[~2015-07-15 16:32 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-09 11:47 [Qemu-devel] [PATCH v4 0/7] Fix QEMU crash during memory hotplug with vhost=on Igor Mammedov
2015-07-09 11:47 ` [Qemu-devel] [PATCH v4 1/7] memory: get rid of memory_region_destructor_ram_from_ptr() Igor Mammedov
2015-07-09 11:47 ` [Qemu-devel] [PATCH v4 2/7] memory: introduce MemoryRegion container with reserved HVA range Igor Mammedov
2015-07-09 11:47 ` [Qemu-devel] [PATCH v4 3/7] pc: reserve hotpluggable memory range with memory_region_init_hva_range() Igor Mammedov
2015-07-09 11:47 ` [Qemu-devel] [PATCH v4 4/7] pc: fix QEMU crashing when more than ~50 memory hotplugged Igor Mammedov
2015-07-09 13:06 ` Michael S. Tsirkin
2015-07-09 13:43 ` Paolo Bonzini
2015-07-09 13:46 ` Michael S. Tsirkin
2015-07-10 10:12 ` Igor Mammedov
2015-07-13 6:55 ` Michael S. Tsirkin
2015-07-13 18:55 ` Igor Mammedov
2015-07-13 20:14 ` Michael S. Tsirkin
2015-07-14 13:02 ` Igor Mammedov
2015-07-14 13:14 ` Michael S. Tsirkin
2015-07-09 11:47 ` [Qemu-devel] [PATCH v4 5/7] exec: make sure that RAMBlock descriptor won't be leaked Igor Mammedov
2015-07-09 11:47 ` [Qemu-devel] [PATCH v4 6/7] exec: add qemu_ram_unmap_hva() API for unmapping memory from HVA area Igor Mammedov
2015-07-09 11:47 ` [Qemu-devel] [PATCH v4 7/7] memory: add support for deleting HVA mapped MemoryRegion Igor Mammedov
2015-07-15 15:12 ` [Qemu-devel] [PATCH v4 0/7] Fix QEMU crash during memory hotplug with vhost=on Igor Mammedov
2015-07-15 16:32 ` Michael S. Tsirkin [this message]
2015-07-16 7:26 ` Igor Mammedov
2015-07-16 7:35 ` Michael S. Tsirkin
2015-07-16 9:42 ` Igor Mammedov
2015-07-16 10:24 ` Michael S. Tsirkin
2015-07-16 11:11 ` Igor Mammedov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20150715192933-mutt-send-email-mst@redhat.com \
--to=mst@redhat.com \
--cc=imammedo@redhat.com \
--cc=pbonzini@redhat.com \
--cc=peter.maydell@linaro.org \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.