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Commit 034702a6 authored by Juergen Gross's avatar Juergen Gross Committed by Boris Ostrovsky
Browse files

xen/netfront: set default upper limit of tx/rx queues to 8 



The default for the number of tx/rx queues of one interface is the
number of vcpus of the system today. As each queue pair reserves 512
grant pages this default consumes a ridiculous number of grants for
large guests.

Limit the queue number to 8 as default. This value can be modified
via a module parameter if required.

Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
parent 566cf877

drivers/net/xen-netfront.c

+4 −2
Original line number Original line Diff line number Diff line
@@ -57,6 +57,7 @@ 
#include <xen/interface/grant_table.h>

#include <xen/interface/grant_table.h>





/* Module parameters */

/* Module parameters */

#define MAX_QUEUES_DEFAULT 8

static unsigned int xennet_max_queues;

static unsigned int xennet_max_queues;

module_param_named(max_queues, xennet_max_queues, uint, 0644);

module_param_named(max_queues, xennet_max_queues, uint, 0644);

MODULE_PARM_DESC(max_queues,

MODULE_PARM_DESC(max_queues,
@@ -2164,11 +2165,12 @@ static int __init netif_init(void) 




	pr_info("Initialising Xen virtual ethernet driver\n");

	pr_info("Initialising Xen virtual ethernet driver\n");





	/* Allow as many queues as there are CPUs if user has not

	/* Allow as many queues as there are CPUs inut max. 8 if user has not

	 * specified a value.

	 * specified a value.

	 */

	 */

	if (xennet_max_queues == 0)

	if (xennet_max_queues == 0)

		xennet_max_queues = num_online_cpus();

		xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT,

					  num_online_cpus());





	return xenbus_register_frontend(&netfront_driver);

	return xenbus_register_frontend(&netfront_driver);

}

}