From: Jason Wang <jasowang@redhat.com>
To: rusty@rustcorp.com.au, mst@redhat.com,
virtualization@lists.linux-foundation.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 3/3] virtio-net: using single MSIX irq for each TX/RX queue pair
Date: Fri, 26 Dec 2014 18:17:02 +0800 [thread overview]
Message-ID: <549D359E.7080401@redhat.com> (raw)
In-Reply-To: <1419562425-20614-4-git-send-email-jasowang@redhat.com>
On 12/26/2014 10:53 AM, Jason Wang wrote:
> This patch try to reduce the number of MSIX irqs required for
> virtio-net by sharing a MSIX irq for each TX/RX queue pair through
> channels. If transport support channel, about half of the MSIX irqs
> were reduced.
>
> Cc: Rusty Russell <rusty@rustcorp.com.au>
> Cc: Michael S. Tsirkin <mst@redhat.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
> drivers/net/virtio_net.c | 26 +++++++++++++++++++++++++-
> 1 file changed, 25 insertions(+), 1 deletion(-)
>
Note: an issue with this patch is it may trigger tx irq handler if at
least one more used. We could solve this by checking the used idx and
bypass the tx irq if host does not signal us. (Or just does the old tx
skbs reclaiming before the checking.)
next prev parent reply other threads:[~2014-12-26 10:17 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-26 2:53 [RFC PATCH 0/3] Sharing MSIX irq for tx/rx queue pairs Jason Wang
2014-12-26 2:53 ` [RFC PATCH 1/3] virtio-pci: introduce channels Jason Wang
2014-12-26 2:53 ` [RFC PATCH 2/3] virtio: let vp_find_vqs accept channel setting paramters Jason Wang
2014-12-26 2:53 ` [RFC PATCH 3/3] virtio-net: using single MSIX irq for each TX/RX queue pair Jason Wang
2014-12-26 10:17 ` Jason Wang [this message]
2014-12-28 7:52 ` [RFC PATCH 0/3] Sharing MSIX irq for tx/rx queue pairs Michael S. Tsirkin
2015-01-04 8:38 ` Jason Wang
2015-01-04 11:36 ` Michael S. Tsirkin
2015-01-05 3:09 ` Jason Wang
2015-01-05 1:39 ` Rusty Russell
2015-01-05 5:10 ` Jason Wang
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