Re: [PATCH RFC 4/4] vsock/virtio: increase RX buffer size to 64 KiB

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On 2019/4/5 下午4:44, Stefan Hajnoczi wrote:
On Thu, Apr 04, 2019 at 12:58:38PM +0200, Stefano Garzarella wrote:
In order to increase host -> guest throughput with large packets,
we can use 64 KiB RX buffers.

Signed-off-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
---
  include/linux/virtio_vsock.h | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
index 6d7a22cc20bf..43cce304408e 100644
--- a/include/linux/virtio_vsock.h
+++ b/include/linux/virtio_vsock.h
@@ -10,7 +10,7 @@
  #define VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE	128
  #define VIRTIO_VSOCK_DEFAULT_BUF_SIZE		(1024 * 256)
  #define VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE	(1024 * 256)
-#define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE	(1024 * 4)
+#define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE	(1024 * 64)
This patch raises rx ring memory consumption from 128 * 4KB = 512KB to
128 * 64KB = 8MB.

Michael, Jason: Any advice regarding rx/tx ring sizes and buffer sizes?

Depending on rx ring size and the workload's packet size, different
values might be preferred.

This could become a tunable in the future.  It determines the size of
the guest driver's rx buffers.


In virtio-net, we have mergeable rx buffer and estimate the rx buffer size through EWMA.

That's another reason I suggest to squash the vsock codes into virtio-net.

Thanks

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