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| author | Juergen Gross <jgross@suse.com> | 2017-01-10 14:32:51 +0100 |
|---|---|---|
| committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2017-01-29 18:48:27 -0500 |
| commit | 034702a64a6692a8d5d0d9630064a014fc633728 (patch) | |
| tree | f7f0eb533a330e3ed8dddb9291caeb8967203d94 | |
| parent | 566cf877a1fcb6d6dc0126b076aad062054c2637 (diff) | |
| download | op-kernel-dev-034702a64a6692a8d5d0d9630064a014fc633728.zip op-kernel-dev-034702a64a6692a8d5d0d9630064a014fc633728.tar.gz | |
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: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
| -rw-r--r-- | drivers/net/xen-netfront.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c index 8315fe7..7ce5d2f 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -57,6 +57,7 @@ #include <xen/interface/grant_table.h> /* Module parameters */ +#define MAX_QUEUES_DEFAULT 8 static unsigned int xennet_max_queues; module_param_named(max_queues, xennet_max_queues, uint, 0644); MODULE_PARM_DESC(max_queues, @@ -2164,11 +2165,12 @@ static int __init netif_init(void) 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. */ 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); } |
