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...18/12/12 23:09, Michael S. Tsirkin wrote: > On Wed, Dec 12, 2018 at 05:25:50PM +0800, jiangyiwen wrote: >> Now vsock only support send/receive small packet, it can't achieve >> high performance. As previous discussed with Jason Wang, I revisit the >> idea of vhost-net about mergeable rx buffer and implement the mergeable >> rx buffer in vhost-vsock, it can allow big packet to be scattered in >> into different buffers and improve performance obviously. >> >> This series of patches mainly did three things? >> - mergeable buffer implementation >&g...

Now vsock only support send/receive small packet, it can't achieve high performance. As previous discussed with Jason Wang, I revisit the idea of vhost-net about mergeable rx buffer and implement the mergeable rx buffer in vhost-vsock, it can allow big packet to be scattered in into different buffers and improve performance obviously. This series of patches mainly did three things? - mergeable buffer implementation - increase the max send pkt size - add used and si...

Now vsock only support send/receive small packet, it can't achieve high performance. As previous discussed with Jason Wang, I revisit the idea of vhost-net about mergeable rx buffer and implement the mergeable rx buffer in vhost-vsock, it can allow big packet to be scattered in into different buffers and improve performance obviously. This series of patches mainly did three things? - mergeable buffer implementation - increase the max send pkt size - add used and si...

Now vsock only support send/receive small packet, it can't achieve high performance. As previous discussed with Jason Wang, I revisit the idea of vhost-net about mergeable rx buffer and implement the mergeable rx buffer in vhost-vsock, it can allow big packet to be scattered in into different buffers and improve performance obviously. I write a tool to test the vhost-vsock performance, mainly send big packet(64K) included guest->Host and Host->Guest. The resu...

Now vsock only support send/receive small packet, it can't achieve high performance. As previous discussed with Jason Wang, I revisit the idea of vhost-net about mergeable rx buffer and implement the mergeable rx buffer in vhost-vsock, it can allow big packet to be scattered in into different buffers and improve performance obviously. I write a tool to test the vhost-vsock performance, mainly send big packet(64K) included guest->Host and Host->Guest. The resu...

Since VSOCK already support mergeable rx buffer, so it can implement the balance with performance and guest memory, we can increase the sent pkt len to improve performance. And in order to be compatible with old version, so we still send max default rx buf size once. Signed-off-by: Yiwen Jiang <jiangyiwen at huawei.com> --- dr...

On Wed, Dec 12, 2018 at 05:25:50PM +0800, jiangyiwen wrote: > Now vsock only support send/receive small packet, it can't achieve > high performance. As previous discussed with Jason Wang, I revisit the > idea of vhost-net about mergeable rx buffer and implement the mergeable > rx buffer in vhost-vsock, it can allow big packet to be scattered in > into different buffers and improve performance obviously. > > This series of patches mainly did three things? > - mergeable buffer implementation > - increase the max s...

In driver probing, if virtio has VIRTIO_VSOCK_F_MRG_RXBUF feature, it will fill mergeable rx buffer, support for host send mergeable rx buffer. It will fill a page everytime to compact with small packet and big packet. Signed-off-by: Yiwen Jiang <jiangyiwen at huawei.com> --- include/linux/virtio_vsock.h | 3 ++ net/vmw_vsock/virtio_transport.c | 72 +++++++++++++++++++++++...

In driver probing, if virtio has VIRTIO_VSOCK_F_MRG_RXBUF feature, it will fill mergeable rx buffer, support for host send mergeable rx buffer. It will fill a page everytime to compact with small packet and big packet. Signed-off-by: Yiwen Jiang <jiangyiwen at huawei.com> --- include/linux/virtio_vsock.h | 3 ++ net/vmw_vsock/virtio_transport.c | 72 +++++++++++++++++++++++...

...c void vhost_transport_do_send_pkt(struct vhost_vsock *vsock, struct vhost_virtqueue *vq) @@ -87,22 +151,34 @@ static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; bool added = false; bool restart_tx = false; + int mergeable; + size_t vsock_hlen; mutex_lock(&vq->mutex); if (!vq->private_data) goto out; + mergeable = vhost_has_feature(vq, VIRTIO_VSOCK_F_MRG_RXBUF); + /* + * Guest fill page for rx vq in mergeable case, so it will not + * allocate pkt structure, we should reserve size of pkt in adva...

...c void vhost_transport_do_send_pkt(struct vhost_vsock *vsock, struct vhost_virtqueue *vq) @@ -87,22 +151,34 @@ static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; bool added = false; bool restart_tx = false; + int mergeable; + size_t vsock_hlen; mutex_lock(&vq->mutex); if (!vq->private_data) goto out; + mergeable = vhost_has_feature(vq, VIRTIO_VSOCK_F_MRG_RXBUF); + /* + * Guest fill page for rx vq in mergeable case, so it will not + * allocate pkt structure, we should reserve size of pkt in adva...

...tc.) to create data. Even though this scheme works in most cases, there are a few situations that doesn't work well as you may have noticed. Here are a issues. - You cannot mix special sections with other types of sections. For example, using linker scripts, you can instruct the linker put mergeable sections and non-mergeable sections into the same output section. Such script makes sense. However, LLD cannot handle such script because string merging is the special mergeable output section's feature. The output section doesn't know how to handle other types of sections, so you cannot f...

...c void vhost_transport_do_send_pkt(struct vhost_vsock *vsock, struct vhost_virtqueue *vq) @@ -87,22 +150,34 @@ static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; bool added = false; bool restart_tx = false; + int mergeable; + size_t vsock_hlen; mutex_lock(&vq->mutex); if (!vq->private_data) goto out; + mergeable = vhost_has_feature(vq, VIRTIO_VSOCK_F_MRG_RXBUF); + /* + * Guest fill page for rx vq in mergeable case, so it will not + * allocate pkt structure, we should reserve size of pkt in adva...

...c void vhost_transport_do_send_pkt(struct vhost_vsock *vsock, struct vhost_virtqueue *vq) @@ -87,22 +150,34 @@ static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; bool added = false; bool restart_tx = false; + int mergeable; + size_t vsock_hlen; mutex_lock(&vq->mutex); if (!vq->private_data) goto out; + mergeable = vhost_has_feature(vq, VIRTIO_VSOCK_F_MRG_RXBUF); + /* + * Guest fill page for rx vq in mergeable case, so it will not + * allocate pkt structure, we should reserve size of pkt in adva...

On 2018/11/6 11:38, Jason Wang wrote: > > On 2018/11/5 ??3:45, jiangyiwen wrote: >> In driver probing, if virtio has VIRTIO_VSOCK_F_MRG_RXBUF feature, >> it will fill mergeable rx buffer, support for host send mergeable >> rx buffer. It will fill a page everytime to compact with small >> packet and big packet. >> >> Signed-off-by: Yiwen Jiang <jiangyiwen at huawei.com> >> --- >> include/linux/virtio_vsock.h | 3 ++ >>...

...rom skipping them. > > Hi Michael, I don't fully understand what you mean, do you want to see a performance comparison that before performance and only use batching? In my opinion, guest don't fill big buffer in rx vq because the balance performance and guest memory pressure, add mergeable feature can improve big packets performance, as for small packets, I try to find out the reason, may be the fluctuation of test results, or in mergeable mode, when Host send a 4k packet to Guest, we should call vhost_get_vq_desc() twice in host(hdr + 4k data), and in guest we also should call virt...

...rom skipping them. > > Hi Michael, I don't fully understand what you mean, do you want to see a performance comparison that before performance and only use batching? In my opinion, guest don't fill big buffer in rx vq because the balance performance and guest memory pressure, add mergeable feature can improve big packets performance, as for small packets, I try to find out the reason, may be the fluctuation of test results, or in mergeable mode, when Host send a 4k packet to Guest, we should call vhost_get_vq_desc() twice in host(hdr + 4k data), and in guest we also should call virt...

Guest receive mergeable rx buffer, it can merge scatter rx buffer into a big buffer and then copy to user space. Signed-off-by: Yiwen Jiang <jiangyiwen at huawei.com> --- include/linux/virtio_vsock.h | 9 ++++ net/vmw_vsock/virtio_transport.c | 75 +++++++++++++++++++++++++++++---- net/vmw_vsoc...

Guest receive mergeable rx buffer, it can merge scatter rx buffer into a big buffer and then copy to user space. Signed-off-by: Yiwen Jiang <jiangyiwen at huawei.com> --- include/linux/virtio_vsock.h | 9 ++++ net/vmw_vsock/virtio_transport.c | 75 +++++++++++++++++++++++++++++---- net/vmw_vsoc...

On 2018/11/5 ??3:43, jiangyiwen wrote: > Now vsock only support send/receive small packet, it can't achieve > high performance. As previous discussed with Jason Wang, I revisit the > idea of vhost-net about mergeable rx buffer and implement the mergeable > rx buffer in vhost-vsock, it can allow big packet to be scattered in > into different buffers and improve performance obviously. > > I write a tool to test the vhost-vsock performance, mainly send big > packet(64K) included guest->Host and...