diff options
Diffstat (limited to 'src/vnet/devices/virtio/vhost_user_output.c')
| -rw-r--r-- | src/vnet/devices/virtio/vhost_user_output.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/vnet/devices/virtio/vhost_user_output.c b/src/vnet/devices/virtio/vhost_user_output.c index c0c54d1b13a..de34a3a86b0 100644 --- a/src/vnet/devices/virtio/vhost_user_output.c +++ b/src/vnet/devices/virtio/vhost_user_output.c @@ -49,9 +49,12 @@ * entries. In order to not corrupt memory, we have to do the copy when the * static array reaches the copy threshold. We subtract 40 in case the code * goes into the inner loop for a maximum of 64k frames which may require - * more array entries. + * more array entries. We subtract 200 because our default buffer size is + * 2048 and the default desc len is likely 1536. While it takes less than 40 + * vlib buffers for the jumbo frame, it may take twice as much descriptors + * for the same jumbo frame. Use 200 for the extra head room. */ -#define VHOST_USER_TX_COPY_THRESHOLD (VHOST_USER_COPY_ARRAY_N - 40) +#define VHOST_USER_TX_COPY_THRESHOLD (VHOST_USER_COPY_ARRAY_N - 200) extern vnet_device_class_t vhost_user_device_class; @@ -339,6 +342,7 @@ retry: hdr->num_buffers = 1; //This is local, no need to check // Prepare a copy order executed later for the header + ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N); vhost_copy_t *cpy = &cpu->copy[copy_len]; copy_len++; cpy->len = vui->virtio_net_hdr_sz; @@ -426,6 +430,7 @@ retry: } { + ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N); vhost_copy_t *cpy = &cpu->copy[copy_len]; copy_len++; cpy->len = bytes_left; |