diff options
| author |   Michael S. Tsirkin <mst@redhat.com> | 2012-12-03 10:07:14 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2012-12-03 15:07:36 -0500 |
| commit | 5d097109257c03a71845729f8db6b5770c4bbedc (patch) | |
| tree | 4ef14ea47b21f6f81412c95889ca30147e0f0458 /include | |
| parent | ipv6: Make 'addrconf_rs_timer' send Router Solicitations (and re-arm itself) if Router Advertisements are accepted (diff) | |
| download | linux-dev-5d097109257c03a71845729f8db6b5770c4bbedc.tar.xz linux-dev-5d097109257c03a71845729f8db6b5770c4bbedc.zip | |
tun: only queue packets on device
Historically tun supported two modes of operation:
- in default mode, a small number of packets would get queued
at the device, the rest would be queued in qdisc
- in one queue mode, all packets would get queued at the device
This might have made sense up to a point where we made the
queue depth for both modes the same and set it to
a huge value (500) so unless the consumer
is stuck the chance of losing packets is small.
Thus in practice both modes behave the same, but the
default mode has some problems:
- if packets are never consumed, fragments are never orphaned
which cases a DOS for sender using zero copy transmit
- overrun errors are hard to diagnose: fifo error is incremented
only once so you can not distinguish between
userspace that is stuck and a transient failure,
tcpdump on the device does not show any traffic
Userspace solves this simply by enabling IFF_ONE_QUEUE
but there seems to be little point in not doing the
right thing for everyone, by default.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/if_tun.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h index 958497ad5bb5..2835b85fd46d 100644 --- a/include/uapi/linux/if_tun.h +++ b/include/uapi/linux/if_tun.h @@ -31,6 +31,7 @@ #define TUN_FASYNC 0x0010 #define TUN_NOCHECKSUM 0x0020 #define TUN_NO_PI 0x0040 +/* This flag has no real effect */ #define TUN_ONE_QUEUE 0x0080 #define TUN_PERSIST 0x0100 #define TUN_VNET_HDR 0x0200 @@ -60,6 +61,7 @@ #define IFF_TUN 0x0001 #define IFF_TAP 0x0002 #define IFF_NO_PI 0x1000 +/* This flag has no real effect */ #define IFF_ONE_QUEUE 0x2000 #define IFF_VNET_HDR 0x4000 #define IFF_TUN_EXCL 0x8000 |