From: Rusty Russell <rusty@rustcorp.com.au>
To: Jason Wang <jasowang@redhat.com>,
mst@redhat.com, davem@davemloft.net,
virtualization@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
krkumar2@in.ibm.com
Cc: kvm@vger.kernel.org
Subject: Re: [rfc net-next v6 3/3] virtio-net: change the number of queues through ethtool
Date: Mon, 05 Nov 2012 10:16:02 +1030 [thread overview]
Message-ID: <871ug9yls5.fsf@rustcorp.com.au> (raw)
In-Reply-To: <1351591403-23065-4-git-send-email-jasowang@redhat.com>
Jason Wang <jasowang@redhat.com> writes:
> This patch implement the {set|get}_channels method of ethool to allow user to
> change the number of queues dymaically when the device is running. This would
> let the user to tune the device for specific applications.
...
> + /* Only two modes were support currently */
> + if (queue_pairs == 0)
> + return -EINVAL;
> + if (queue_pairs != vi->total_queue_pairs - 1 && queue_pairs != 1)
> + return -EINVAL;
OK, so you let them do all or nothing, but this three-way test is
pretty unclear.
In fact, the whole total_queue_pairs/num_queue_pairs thing is weird (and
uncommented). I think for "total" you mean "max"; the maximum possible
queue pair number.
Let me go back and review the previous patch again...
Cheers,
Rusty.
WARNING: multiple messages have this Message-ID (diff)
From: Rusty Russell <rusty@rustcorp.com.au>
To: Jason Wang <jasowang@redhat.com>,
mst@redhat.com, davem@davemloft.net,
virtualization@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
krkumar2@in.ibm.com
Cc: kvm@vger.kernel.org, Jason Wang <jasowang@redhat.com>
Subject: Re: [rfc net-next v6 3/3] virtio-net: change the number of queues through ethtool
Date: Mon, 05 Nov 2012 10:16:02 +1030 [thread overview]
Message-ID: <871ug9yls5.fsf@rustcorp.com.au> (raw)
In-Reply-To: <1351591403-23065-4-git-send-email-jasowang@redhat.com>
Jason Wang <jasowang@redhat.com> writes:
> This patch implement the {set|get}_channels method of ethool to allow user to
> change the number of queues dymaically when the device is running. This would
> let the user to tune the device for specific applications.
...
> + /* Only two modes were support currently */
> + if (queue_pairs == 0)
> + return -EINVAL;
> + if (queue_pairs != vi->total_queue_pairs - 1 && queue_pairs != 1)
> + return -EINVAL;
OK, so you let them do all or nothing, but this three-way test is
pretty unclear.
In fact, the whole total_queue_pairs/num_queue_pairs thing is weird (and
uncommented). I think for "total" you mean "max"; the maximum possible
queue pair number.
Let me go back and review the previous patch again...
Cheers,
Rusty.
next prev parent reply other threads:[~2012-11-04 23:46 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-30 10:03 [rfc net-next v6 0/3] Multiqueue virtio-net Jason Wang
2012-10-30 10:03 ` Jason Wang
2012-10-30 10:03 ` [rfc net-next v6 1/3] virtio_net: Introduce VIRTIO_NET_F_MULTIQUEUE Jason Wang
2012-10-30 10:03 ` Jason Wang
2012-10-30 10:03 ` [rfc net-next v6 2/3] virtio_net: multiqueue support Jason Wang
2012-10-30 10:03 ` Jason Wang
2012-11-04 23:16 ` Rusty Russell
2012-11-04 23:16 ` Rusty Russell
2012-11-19 6:18 ` Jason Wang
2012-11-19 6:18 ` Jason Wang
2012-11-05 1:08 ` Rusty Russell
2012-11-05 1:08 ` Rusty Russell
2012-11-13 6:40 ` Michael S. Tsirkin
2012-11-13 6:40 ` Michael S. Tsirkin
2012-11-17 0:35 ` Ben Hutchings
2012-11-17 0:35 ` Ben Hutchings
2012-11-18 9:13 ` Michael S. Tsirkin
2012-11-18 9:13 ` Michael S. Tsirkin
2012-11-19 18:44 ` Ben Hutchings
2012-11-19 18:44 ` Ben Hutchings
2012-11-19 7:40 ` Jason Wang
2012-11-19 7:40 ` Jason Wang
2012-10-30 10:03 ` [rfc net-next v6 3/3] virtio-net: change the number of queues through ethtool Jason Wang
2012-10-30 10:03 ` Jason Wang
2012-11-04 23:46 ` Rusty Russell [this message]
2012-11-04 23:46 ` Rusty Russell
2012-11-19 6:22 ` Jason Wang
2012-11-19 6:22 ` Jason Wang
2012-11-08 21:13 ` Ben Hutchings
2012-11-08 21:13 ` Ben Hutchings
2012-10-30 19:05 ` [rfc net-next v6 0/3] Multiqueue virtio-net Rick Jones
2012-10-30 19:05 ` Rick Jones
2012-10-31 10:33 ` Jason Wang
2012-10-31 10:33 ` Jason Wang
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