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. orignal 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: Chuanyu Qin <qinchuanyu@xxxxxxxxxx> --- drivers/vhost/vhost.c | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 94dbd25..8bee109 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -146,9 +146,10 @@ static inline void vhost_work_queue(struct vhost_dev *dev, if (list_empty(&work->node)) { list_add_tail(&work->node, &dev->work_list); work->queue_seq++; + spin_unlock_irqrestore(&dev->work_lock, flags); wake_up_process(dev->worker); - } - spin_unlock_irqrestore(&dev->work_lock, flags); + } else + spin_unlock_irqrestore(&dev->work_lock, flags); } void vhost_poll_queue(struct vhost_poll *poll) -- 1.7.3.1.msysgit.0 ��.n��������+%������w��{.n�����o�^n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�