From: Jason Wang <jasowang@redhat.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: mst@redhat.com, akong@redhat.com, habanero@linux.vnet.ibm.com,
tahm@linux.vnet.ibm.com, haixiao@juniper.net,
jwhan@filewood.snu.ac.kr, ernesto.martin@viasat.com,
mashirle@us.ibm.com, davem@davemloft.net, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, krkumar2@in.ibm.com,
shemminger@vyatta.com, edumazet@google.com
Subject: Re: [PATCH 5/6] tuntap: per queue 64 bit stats
Date: Tue, 26 Jun 2012 14:28:28 +0800 [thread overview]
Message-ID: <4FE9568C.4040900@redhat.com> (raw)
In-Reply-To: <1340691016.10893.197.camel@edumazet-glaptop>
On 06/26/2012 02:10 PM, Eric Dumazet wrote:
> On Tue, 2012-06-26 at 14:00 +0800, Jason Wang wrote:
>
>> Yes, looks like it's hard to use NETIF_F_LLTX without breaking the u64
>> statistics, may worth to use tx lock and alloc_netdev_mq().
> Yes, this probably needs percpu storage (if you really want to use
> include/linux/u64_stats_sync.h).
>
> But percpu storage seems a bit overkill with a raising number of cpus
> on typical machines.
>
> For loopback device, its fine because we only have one lo device per
> network namespace, and some workloads really hit hard this device.
>
> But for tuntap, I am not sure ?
>
The problem is that we want to collect per-queue statistics. So if we
convert tuntap to use alloc_netdev_mq(), the tx statistics would be
updated under tx lock which looks safe.
>
> --
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next prev parent reply other threads:[~2012-06-26 6:28 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20120625060830.6765.27584.stgit@amd-6168-8-1.englab.nay.redhat.com>
[not found] ` <20120625061018.6765.76633.stgit@amd-6168-8-1.englab.nay.redhat.com>
2012-06-25 8:25 ` [net-next RFC V3 PATCH 4/6] tuntap: multiqueue support Michael S. Tsirkin
2012-06-25 8:41 ` Michael S. Tsirkin
2012-06-26 3:42 ` Jason Wang
2012-06-26 10:42 ` Michael S. Tsirkin
2012-06-27 5:16 ` Jason Wang
2012-06-27 8:44 ` Michael S. Tsirkin
2012-06-28 3:02 ` Jason Wang
2012-06-28 4:52 ` Sridhar Samudrala
2012-06-28 5:31 ` Jason Wang
2012-06-26 5:52 ` Jason Wang
2012-06-26 11:54 ` Michael S. Tsirkin
2012-06-27 5:59 ` Jason Wang
2012-06-27 8:26 ` Michael S. Tsirkin
2012-06-28 3:15 ` Jason Wang
[not found] ` <20120625060945.6765.98618.stgit@amd-6168-8-1.englab.nay.redhat.com>
2012-06-25 8:27 ` [net-next RFC V3 PATCH 1/6] tuntap: move socket to tun_file Michael S. Tsirkin
2012-06-26 5:55 ` Jason Wang
2012-06-25 11:59 ` [net-next RFC V3 0/6] Multiqueue support in tun/tap Jason Wang
2012-06-25 11:59 ` [PATCH 1/6] tuntap: move socket to tun_file Jason Wang
2012-06-25 11:59 ` [PATCH 2/6] tuntap: categorize ioctl Jason Wang
2012-06-25 11:59 ` [PATCH 3/6] tuntap: introduce multiqueue flags Jason Wang
2012-06-25 11:59 ` [PATCH 4/6] tuntap: multiqueue support Jason Wang
2012-06-25 11:59 ` [PATCH 5/6] tuntap: per queue 64 bit stats Jason Wang
2012-06-25 12:52 ` Eric Dumazet
2012-06-26 6:00 ` Jason Wang
2012-06-26 6:10 ` Eric Dumazet
2012-06-26 6:28 ` Jason Wang [this message]
2012-06-26 19:46 ` [PATCH 5/6] tuntap: per queue 64 bit stats\ Michael S. Tsirkin
2012-06-25 11:59 ` [PATCH 6/6] tuntap: add ioctls to attach or detach a file form tuntap device Jason Wang
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