• Qin Chuanyu's avatar
    vhost: wake up worker outside spin_lock · ac9fde24
    Qin Chuanyu authored
    the wake_up_process func is included by spin_lock/unlock in
    vhost_work_queue,
    but it could be done outside the spin_lock.
    I have test it with kernel 3.0.27 and guest suse11-sp2 using iperf,
    the num as below.
                      original                 modified
    thread_num  tp(Gbps)   vhost(%)  |  tp(Gbps)     vhost(%)
    1           9.59        28.82    |   9.59        27.49
    8           9.61        32.92    |   9.62        26.77
    64          9.58        46.48    |   9.55        38.99
    256         9.6         63.7     |   9.6         52.59
    Signed-off-by: default avatarChuanyu Qin <qinchuanyu@huawei.com>
    Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
    ac9fde24
vhost.c 39 KB