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virtio_nic: Increase default TX & RX virtqueue sizes.

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32KB is a rather small value. The driver can cope with it now, but
it does not perform as well as it should. This visible especially
in scenarions like nic_router_flood where we still often hit
synchronous wait path. Bump the size to 256kB.

Issue #4264
This commit is contained in:
Piotr Tworek 2021-09-21 23:43:05 +02:00 committed by Norman Feske
parent 880cd3a490
commit 60980045ea
1 changed files with 3 additions and 3 deletions
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6
repos/os/src/drivers/nic/virtio/component.h
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@ -128,10 +128,10 @@ class Virtio_nic::Device : Noncopyable
* a power of 2. Each VirtIO queue needs some additional space for the descriptor table, * a power of 2. Each VirtIO queue needs some additional space for the descriptor table,
* available and used rings. The default VirtIO queue parameter values defined here have * available and used rings. The default VirtIO queue parameter values defined here have
* been selected to make Ram_dataspace used by both TX and RX VirtIO queues consume around * been selected to make Ram_dataspace used by both TX and RX VirtIO queues consume around
* 32Kb of RAM. * 256kB of RAM.
*/ */
static const uint16_t DEFAULT_VQ_SIZE = 16; static const uint16_t DEFAULT_VQ_SIZE = 64;
static const uint16_t DEFAULT_VQ_BUF_SIZE = 2020; static const uint16_t DEFAULT_VQ_BUF_SIZE = 2016;
struct Rx_queue_traits struct Rx_queue_traits
{ {