tuntap: reduce memory using of queues
authorJason Wang <jasowang@redhat.com>
Wed, 23 Jan 2013 03:59:12 +0000 (03:59 +0000)
committerDavid S. Miller <davem@davemloft.net>
Wed, 23 Jan 2013 18:47:06 +0000 (13:47 -0500)
commitedfb6a148ce62e5e19354a1dcd9a34e00815c2a1
tree839be5ca970b47e5b5fa38c9df3e672732ef6987
parent844e88f04410cc4e85615db519c1d44089333c4f
tuntap: reduce memory using of queues

A MAX_TAP_QUEUES(1024) queues of tuntap device is always allocated
unconditionally even userspace only requires a single queue device. This is
unnecessary and will lead a very high order of page allocation when has a high
possibility to fail. Solving this by creating a one queue net device when
userspace only use one queue and also reduce MAX_TAP_QUEUES to
DEFAULT_MAX_NUM_RSS_QUEUES which can guarantee the success of
the allocation.

Reported-by: Dirk Hohndel <dirk@hohndel.org>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/tun.c