search for: virtio_vsock_max_pkt_buf_size

On Fri, Apr 05, 2019 at 09:24:47AM +0100, Stefan Hajnoczi wrote: > On Thu, Apr 04, 2019 at 12:58:37PM +0200, Stefano Garzarella wrote: > > Since now we are able to split packets, we can avoid limiting > > their sizes to VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE. > > Instead, we can use VIRTIO_VSOCK_MAX_PKT_BUF_SIZE as the max > > packet size. > > > > Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> > > --- > > net/vmw_vsock/virtio_transport_common.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/net/vmw_vsoc...

On Fri, Apr 05, 2019 at 09:24:47AM +0100, Stefan Hajnoczi wrote: > On Thu, Apr 04, 2019 at 12:58:37PM +0200, Stefano Garzarella wrote: > > Since now we are able to split packets, we can avoid limiting > > their sizes to VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE. > > Instead, we can use VIRTIO_VSOCK_MAX_PKT_BUF_SIZE as the max > > packet size. > > > > Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> > > --- > > net/vmw_vsock/virtio_transport_common.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/net/vmw_vsoc...

Since now we are able to split packets, we can avoid limiting their sizes to VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE. Instead, we can use VIRTIO_VSOCK_MAX_PKT_BUF_SIZE as the max packet size. Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> --- net/vmw_vsock/virtio_transport_common.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c index f323...

...9 at 09:24:47AM +0100, Stefan Hajnoczi wrote: > > On Thu, Apr 04, 2019 at 12:58:37PM +0200, Stefano Garzarella wrote: > > > Since now we are able to split packets, we can avoid limiting > > > their sizes to VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE. > > > Instead, we can use VIRTIO_VSOCK_MAX_PKT_BUF_SIZE as the max > > > packet size. > > > > > > Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> > > > --- > > > net/vmw_vsock/virtio_transport_common.c | 4 ++-- > > > 1 file changed, 2 insertions(+), 2 deletions(-) > > >...

...0, Stefan Hajnoczi wrote: > > > On Thu, Apr 04, 2019 at 12:58:37PM +0200, Stefano Garzarella wrote: > > > > Since now we are able to split packets, we can avoid limiting > > > > their sizes to VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE. > > > > Instead, we can use VIRTIO_VSOCK_MAX_PKT_BUF_SIZE as the max > > > > packet size. > > > > > > > > Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> > > > > --- > > > > net/vmw_vsock/virtio_transport_common.c | 4 ++-- > > > > 1 file changed, 2 insertions(+), 2...

...0, Stefan Hajnoczi wrote: > > > On Thu, Apr 04, 2019 at 12:58:37PM +0200, Stefano Garzarella wrote: > > > > Since now we are able to split packets, we can avoid limiting > > > > their sizes to VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE. > > > > Instead, we can use VIRTIO_VSOCK_MAX_PKT_BUF_SIZE as the max > > > > packet size. > > > > > > > > Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> > > > > --- > > > > net/vmw_vsock/virtio_transport_common.c | 4 ++-- > > > > 1 file changed, 2 insertions(+), 2...

...s: - patch 1/4: reduces the number of credit update messages sent to the transmitter - patch 2/4: allows the host to split packets on multiple buffers, in this way, we can remove the packet size limit to VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE - patch 3/4: uses VIRTIO_VSOCK_MAX_PKT_BUF_SIZE as the max packet size allowed - patch 4/4: increases RX buffer size to 64 KiB (affects only host->guest) RFC: - maybe patch 4 can be replaced with multiple queues with different buffer sizes or using EWMA to adapt the buffer size to the traffic - as Jason suggested in a pr...

...s: - patch 1/4: reduces the number of credit update messages sent to the transmitter - patch 2/4: allows the host to split packets on multiple buffers, in this way, we can remove the packet size limit to VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE - patch 3/4: uses VIRTIO_VSOCK_MAX_PKT_BUF_SIZE as the max packet size allowed - patch 4/4: increases RX buffer size to 64 KiB (affects only host->guest) RFC: - maybe patch 4 can be replaced with multiple queues with different buffer sizes or using EWMA to adapt the buffer size to the traffic - as Jason suggested in a pr...

On Thu, Apr 04, 2019 at 12:58:37PM +0200, Stefano Garzarella wrote: > Since now we are able to split packets, we can avoid limiting > their sizes to VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE. > Instead, we can use VIRTIO_VSOCK_MAX_PKT_BUF_SIZE as the max > packet size. > > Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> > --- > net/vmw_vsock/virtio_transport_common.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vs...

On Wed, Jul 17, 2019 at 01:30:30PM +0200, Stefano Garzarella wrote: > Since now we are able to split packets, we can avoid limiting > their sizes to VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE. > Instead, we can use VIRTIO_VSOCK_MAX_PKT_BUF_SIZE as the max > packet size. > > Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> OK so this is kind of like GSO where we are passing 64K packets to the vsock and then split at the low level. > --- > net/vmw_vsock/virtio_transport_common.c | 4 ++-- > 1 file cha...

On Wed, Jul 17, 2019 at 01:30:30PM +0200, Stefano Garzarella wrote: > Since now we are able to split packets, we can avoid limiting > their sizes to VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE. > Instead, we can use VIRTIO_VSOCK_MAX_PKT_BUF_SIZE as the max > packet size. > > Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> OK so this is kind of like GSO where we are passing 64K packets to the vsock and then split at the low level. > --- > net/vmw_vsock/virtio_transport_common.c | 4 ++-- > 1 file cha...

On Wed, Jul 17, 2019 at 01:30:27PM +0200, Stefano Garzarella wrote: > In order to reduce the number of credit update messages, > we send them only when the space available seen by the > transmitter is less than VIRTIO_VSOCK_MAX_PKT_BUF_SIZE. > > Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> > --- > include/linux/virtio_vsock.h | 1 + > net/vmw_vsock/virtio_transport_common.c | 16 +++++++++++++--- > 2 files changed, 14 insertions(+), 3 deletions(-) > > diff --git a/include/linu...

On Wed, Jul 17, 2019 at 01:30:27PM +0200, Stefano Garzarella wrote: > In order to reduce the number of credit update messages, > we send them only when the space available seen by the > transmitter is less than VIRTIO_VSOCK_MAX_PKT_BUF_SIZE. > > Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> > --- > include/linux/virtio_vsock.h | 1 + > net/vmw_vsock/virtio_transport_common.c | 16 +++++++++++++--- > 2 files changed, 14 insertions(+), 3 deletions(-) > > diff --git a/include/linu...

...ck/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -307,8 +307,13 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk, spin_unlock_bh(&vvs->rx_lock); - /* We send a credit update only when the space available seen - * by the transmitter is less than VIRTIO_VSOCK_MAX_PKT_BUF_SIZE + /* To reduce the number of credit update messages, + * don't update credits as long as lots of space is available. + * Note: the limit chosen here is arbitrary. Setting the limit + * too high causes extra messages. Too low causes transmitter + * stalls. As stalls are in theory more expens...

In order to reduce the number of credit update messages, we send them only when the space available seen by the transmitter is less than VIRTIO_VSOCK_MAX_PKT_BUF_SIZE. Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> --- include/linux/virtio_vsock.h | 1 + net/vmw_vsock/virtio_transport_common.c | 14 +++++++++++--- 2 files changed, 12 insertions(+), 3 deletions(-) diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vs...

...--- a/include/linux/virtio_vsock.h >>>> +++ b/include/linux/virtio_vsock.h >>>> @@ -13,6 +13,8 @@ >>>> #define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE (1024 * 4) >>>> #define VIRTIO_VSOCK_MAX_BUF_SIZE 0xFFFFFFFFUL >>>> #define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE (1024 * 64) >>>> +/* virtio_vsock_pkt + max_pkt_len(default MAX_PKT_BUF_SIZE) */ >>>> +#define VIRTIO_VSOCK_MAX_MRG_BUF_NUM ((VIRTIO_VSOCK_MAX_PKT_BUF_SIZE / PAGE_SIZE) + 1) >>>> >>>> /* Virtio-vsock feature */ >>>> #define VI...

...> index da9e1fe..6be3cd7 100644 >> --- a/include/linux/virtio_vsock.h >> +++ b/include/linux/virtio_vsock.h >> @@ -13,6 +13,8 @@ >> #define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE (1024 * 4) >> #define VIRTIO_VSOCK_MAX_BUF_SIZE 0xFFFFFFFFUL >> #define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE (1024 * 64) >> +/* virtio_vsock_pkt + max_pkt_len(default MAX_PKT_BUF_SIZE) */ >> +#define VIRTIO_VSOCK_MAX_MRG_BUF_NUM ((VIRTIO_VSOCK_MAX_PKT_BUF_SIZE / PAGE_SIZE) + 1) >> >> /* Virtio-vsock feature */ >> #define VIRTIO_VSOCK_F_MRG_RXBUF 0 /* Host can merge...

...> index da9e1fe..6be3cd7 100644 >> --- a/include/linux/virtio_vsock.h >> +++ b/include/linux/virtio_vsock.h >> @@ -13,6 +13,8 @@ >> #define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE (1024 * 4) >> #define VIRTIO_VSOCK_MAX_BUF_SIZE 0xFFFFFFFFUL >> #define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE (1024 * 64) >> +/* virtio_vsock_pkt + max_pkt_len(default MAX_PKT_BUF_SIZE) */ >> +#define VIRTIO_VSOCK_MAX_MRG_BUF_NUM ((VIRTIO_VSOCK_MAX_PKT_BUF_SIZE / PAGE_SIZE) + 1) >> >> /* Virtio-vsock feature */ >> #define VIRTIO_VSOCK_F_MRG_RXBUF 0 /* Host can merge...

Since now we are able to split packets, we can avoid limiting their sizes to VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE. Instead, we can use VIRTIO_VSOCK_MAX_PKT_BUF_SIZE as the max packet size. Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> --- net/vmw_vsock/virtio_transport_common.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c index 56fa...

In order to reduce the number of credit update messages, we send them only when the space available seen by the transmitter is less than VIRTIO_VSOCK_MAX_PKT_BUF_SIZE. Signed-off-by: Stefano Garzarella <sgarzare at redhat.com> --- include/linux/virtio_vsock.h | 1 + net/vmw_vsock/virtio_transport_common.c | 16 +++++++++++++--- 2 files changed, 14 insertions(+), 3 deletions(-) diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_...