Commit baf71c5c authored Jan 12, 2015 by Pankaj Gupta Committed by David S. Miller Jan 12, 2015

tuntap: Increase the number of queues in tun.



Networking under kvm works best if we allocate a per-vCPU RX and TX
queue in a virtual NIC. This requires a per-vCPU queue on the host side.

It is now safe to increase the maximum number of queues.
Preceding patch: 'net: allow large number of rx queues'
made sure this won't cause failures due to high order memory
allocations. Increase it to 256: this is the max number of vCPUs
KVM supports.

Size of tun_struct changes from 8512 to 10496 after this patch. This keeps
pages allocated for tun_struct before and after the patch to 3.

Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
Reviewed-by: David Gibson <dgibson@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 10595902

drivers/net/tun.c

+3 −4

Original line number	Diff line number	Diff line
		@@ -124,10 +124,9 @@ struct tap_filter {
		unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN];
		};

		/* DEFAULT_MAX_NUM_RSS_QUEUES were chosen to let the rx/tx queues allocated for
		* the netdevice to be fit in one page. So we can make sure the success of
		* memory allocation. TODO: increase the limit. */
		#define MAX_TAP_QUEUES DEFAULT_MAX_NUM_RSS_QUEUES
		/* MAX_TAP_QUEUES 256 is chosen to allow rx/tx queues to be equal
		* to max number of VCPUs in guest. */
		#define MAX_TAP_QUEUES 256
		#define MAX_TAP_FLOWS 4096

		#define TUN_FLOW_EXPIRE (3 * HZ)

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