From: Eric Dumazet <eric.dumazet@gmail.com>
To: Jason Wang <jasowang@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
davem@davemloft.net, edumazet@google.com, hkchu@google.com,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [net-next rfc 1/3] net: avoid high order memory allocation for queues by using flex array
Date: Wed, 19 Jun 2013 23:05:12 -0700 [thread overview]
Message-ID: <1371708312.3252.359.camel@edumazet-glaptop> (raw)
In-Reply-To: <51C28FA7.2070901@redhat.com>
On Thu, 2013-06-20 at 13:14 +0800, Jason Wang wrote:
> A drawback of NETIF_F_LLTX is that we may contend on qdisc lock
> especially when we have a huge number of tx queues.
For your information loopback driver is LLTX, and there is no qdisc on
it, unless you specifically add one.
Once you add a qdisc on a device, you hit the typical contention on a
spinlock. But its hard to design a parallel qdisc. So far nobody did
that.
next prev parent reply other threads:[~2013-06-20 6:05 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-19 5:40 [net-next rfc 0/3] increase the limit of tuntap queues Jason Wang
2013-06-19 5:40 ` [net-next rfc 1/3] net: avoid high order memory allocation for queues by using flex array Jason Wang
2013-06-19 6:31 ` Eric Dumazet
2013-06-19 7:14 ` Jason Wang
2013-06-19 9:11 ` Michael S. Tsirkin
2013-06-19 9:56 ` Eric Dumazet
2013-06-19 12:22 ` Michael S. Tsirkin
2013-06-19 15:40 ` Michael S. Tsirkin
2013-06-19 15:58 ` Eric Dumazet
2013-06-19 16:06 ` David Laight
2013-06-19 16:28 ` Eric Dumazet
2013-06-19 18:07 ` Michael S. Tsirkin
2013-06-20 8:15 ` [PATCH net-next] net: allow large number of tx queues Eric Dumazet
2013-06-20 8:35 ` Michael S. Tsirkin
2013-06-21 6:41 ` Jason Wang
2013-06-21 7:12 ` Eric Dumazet
2013-06-23 10:29 ` Michael S. Tsirkin
2013-06-24 6:57 ` David Miller
2013-06-20 5:14 ` [net-next rfc 1/3] net: avoid high order memory allocation for queues by using flex array Jason Wang
2013-06-20 6:05 ` Eric Dumazet [this message]
2013-06-19 5:40 ` [net-next rfc 2/3] tuntap: reduce the size of tun_struct " Jason Wang
2013-06-19 5:40 ` [net-next rfc 3/3] tuntap: increase the max queues to 16 Jason Wang
2013-06-19 6:34 ` Eric Dumazet
2013-06-19 7:15 ` Jason Wang
2013-06-19 19:16 ` Jerry Chu
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