diff options
| author | Dexuan Cui <decui@microsoft.com> | 2016-01-27 22:29:39 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-07 21:34:12 -0800 |
| commit | 5f363bc38f810d238d1e8b19998625ddec3b8138 (patch) | |
| tree | 1f4c250e523d5764966847ac122f41780d7e2d50 /drivers/hv/channel.c | |
| parent | e8d6ca023efce3bd80050dcd9e708ee3cf8babd4 (diff) | |
Drivers: hv: vmbus: vmbus_sendpacket_ctl: hvsock: avoid unnecessary signaling
When the hvsock channel's outbound ringbuffer is full (i.e.,
hv_ringbuffer_write() returns -EAGAIN), we should avoid the unnecessary
signaling the host.
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv/channel.c')
| -rw-r--r-- | drivers/hv/channel.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c index 1161d68a1863..3f0453302146 100644 --- a/drivers/hv/channel.c +++ b/drivers/hv/channel.c @@ -659,6 +659,9 @@ int vmbus_sendpacket_ctl(struct vmbus_channel *channel, void *buffer, * If we cannot write to the ring-buffer; signal the host * even if we may not have written anything. This is a rare * enough condition that it should not matter. + * NOTE: in this case, the hvsock channel is an exception, because + * it looks the host side's hvsock implementation has a throttling + * mechanism which can hurt the performance otherwise. */ if (channel->signal_policy) @@ -666,7 +669,8 @@ int vmbus_sendpacket_ctl(struct vmbus_channel *channel, void *buffer, else kick_q = true; - if (((ret == 0) && kick_q && signal) || (ret)) + if (((ret == 0) && kick_q && signal) || + (ret && !is_hvsock_channel(channel))) vmbus_setevent(channel); return ret; |