On Fri, May 31, 2019 at 03:39:50PM +0200, Stefano Garzarella wrote: > Since virtio-vsock was introduced, the buffers filled by the host > and pushed to the guest using the vring, are directly queued in > a per-socket list. These buffers are preallocated by the guest > with a fixed size (4 KB). > > The maximum amount of memory used by each socket should be > controlled by the credit mechanism. > The default credit available per-socket is 256 KB, but if we use > only 1 byte per packet, the guest can queue up to 262144 of 4 KB > buffers, using up to 1 GB of memory per-socket. In addition, the > guest will continue to fill the vring with new 4 KB free buffers > to avoid starvation of other sockets. > > This patch mitigates this issue copying the payload of small > packets (< 128 bytes) into the buffer of last packet queued, in > order to avoid wasting memory. > > Signed-off-by: Stefano Garzarella <sgarzare@xxxxxxxxxx> > --- > drivers/vhost/vsock.c | 2 + > include/linux/virtio_vsock.h | 1 + > net/vmw_vsock/virtio_transport.c | 1 + > net/vmw_vsock/virtio_transport_common.c | 60 +++++++++++++++++++++---- > 4 files changed, 55 insertions(+), 9 deletions(-) Reviewed-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
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