From: Eric Dumazet <eric.dumazet@gmail.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Stephen Hemminger <shemminger@vyatta.com>,
Jason Wang <jasowang@redhat.com>,
netdev@vger.kernel.org, rusty@rustcorp.com.au,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org
Subject: Re: [PATCH] virtio-net: fix a race on 32bit arches
Date: Wed, 06 Jun 2012 21:54:01 +0200 [thread overview]
Message-ID: <1339012441.26966.48.camel@edumazet-glaptop> (raw)
In-Reply-To: <20120606185107.GA20503@redhat.com>
On Wed, 2012-06-06 at 21:51 +0300, Michael S. Tsirkin wrote:
> BTW for cards that do implement the counters in software,
> under xmit lock, is anything wrong with simply taking the xmit lock
> when we get the stats instead of the per-cpu trick + seqlock?
>
I still dont understand why you would do that.
Most modern machines are 64bits, so there is no seqlock overhead,
nothing at all.
If you focus on 32bit hardware, just stick on 32bit counters ?
Note that most u64_stats_sync users are virtual drivers, without xmit
lock (LLTX drivers)
next prev parent reply other threads:[~2012-06-06 19:54 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-06 8:35 [PATCH] virtio-net: fix a race on 32bit arches Eric Dumazet
2012-06-06 8:45 ` Eric Dumazet
2012-06-06 9:37 ` Jason Wang
2012-06-06 11:13 ` Michael S. Tsirkin
2012-06-06 13:10 ` Eric Dumazet
2012-06-06 14:49 ` Michael S. Tsirkin
2012-06-06 15:14 ` Stephen Hemminger
2012-06-06 18:51 ` Michael S. Tsirkin
2012-06-06 19:54 ` Eric Dumazet [this message]
2012-06-06 19:58 ` Michael S. Tsirkin
2012-06-06 20:08 ` Eric Dumazet
2012-06-06 20:16 ` Michael S. Tsirkin
2012-06-06 20:24 ` Eric Dumazet
2012-06-06 20:38 ` Eric Dumazet
2012-06-06 20:35 ` Ben Hutchings
2012-06-06 20:43 ` Michael S. Tsirkin
2012-06-06 20:19 ` Ben Hutchings
2012-06-06 20:25 ` Eric Dumazet
2012-06-06 15:19 ` Eric Dumazet
2012-06-06 16:17 ` Michael S. Tsirkin
2012-06-06 17:13 ` Eric Dumazet
2012-06-06 18:43 ` Michael S. Tsirkin
2012-06-06 20:06 ` Eric Dumazet
2012-06-06 20:19 ` Michael S. Tsirkin
2012-06-06 16:57 ` Michael S. Tsirkin
2012-06-06 20:00 ` Eric Dumazet
2012-06-10 6:36 ` Rusty Russell
2012-06-10 7:03 ` Michael S. Tsirkin
2012-06-10 10:21 ` Eric Dumazet
2012-06-10 10:22 ` Michael S. Tsirkin
2012-06-10 10:25 ` Michael S. Tsirkin
2012-06-11 3:23 ` David Miller
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