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On Wed, Nov 23, 2022 at 10:07:49PM -0800, Bobby Eshleman wrote:
This commit changes virtio/vsock to use sk_buff instead of
virtio_vsock_pkt. Beyond better conforming to other net code, using
sk_buff allows vsock to use sk_buff-dependent features in the future
(such as sockmap) and improves throughput.
This patch introduces the following performance changes:
Tool/Config: uperf w/ 64 threads, SOCK_STREAM
Test Runs: 5, mean of results
Before: commit 95ec6bce2a0b ("Merge branch 'net-ipa-more-endpoints'")
Test: 64KB, g2h
Before: 21.63 Gb/s
After: 25.59 Gb/s (+18%)
Test: 16B, g2h
Before: 11.86 Mb/s
After: 17.41 Mb/s (+46%)
Test: 64KB, h2g
Before: 2.15 Gb/s
After: 3.6 Gb/s (+67%)
Test: 16B, h2g
Before: 14.38 Mb/s
After: 18.43 Mb/s (+28%)
Signed-off-by: Bobby Eshleman <bobby.eshleman@xxxxxxxxxxxxx>
---
The patch LGTM. I run several tests (iperf3, vsock_test,
vsock_diag_test, vhost-user-vsock, tcpdump) and IMO we are okay.
I found the following problems that I would like to report:
- vhost-user-vsock [1] is failing, but it is not an issue of this patch,
but a spec violation in the rust-vmm/vm-virtio/virtio-vsock crate as I
reported here [2]. We will fix it there, this patch is fine, indeed
trying a guest with the new layout (1 descriptor for both header and
data) with vhost-vsock in Linux 6.0, everything works perfectly.
- the new "SOCK_SEQPACKET msg bounds" [3] reworked by Arseniy fails
intermittently with this patch.
Using the tests currently in the kernel tree everything is fine, so
I don't understand if it's a problem in the new test or in this
patch. I've looked at the code again and don't seem to see any
criticisms.
@Arseniy @Bobby can you take a look?
I'll try to take a closer look too, and before I give my R-b I'd like
to make sure it's a problem in the test and not in this patch.
This is what I have (some times, not always) with both host and guest
with this patch and the series of [3] applied:
host$ ./vsock_test --control-host=192.168.133.3 --control-port=12345 \
--mode=client --peer-cid=4
Control socket connected to 192.168.133.3:12345.
0 - SOCK_STREAM connection reset...ok
1 - SOCK_STREAM bind only...ok
2 - SOCK_STREAM client close...ok
3 - SOCK_STREAM server close...ok
4 - SOCK_STREAM multiple connections...ok
5 - SOCK_STREAM MSG_PEEK...ok
6 - SOCK_SEQPACKET msg bounds...ok
7 - SOCK_SEQPACKET MSG_TRUNC flag...recv: Connection reset by peer
guest$ ./vsock_test --control-port=12345 --mode=server --peer-cid=2
Control socket listening on 0.0.0.0:12345
Control socket connection accepted...
0 - SOCK_STREAM connection reset...ok
1 - SOCK_STREAM bind only...ok
2 - SOCK_STREAM client close...ok
3 - SOCK_STREAM server close...ok
4 - SOCK_STREAM multiple connections...ok
5 - SOCK_STREAM MSG_PEEK...ok
6 - SOCK_SEQPACKET msg bounds...Message bounds broken
Thanks,
Stefano
[1] https://github.com/rust-vmm/vhost-device/tree/main/crates/vsock
[2] https://github.com/rust-vmm/vm-virtio/issues/204
[3] https://lore.kernel.org/lkml/c991dffd-1dbc-e1d1-b682-a3c71f6ce51c@xxxxxxxxxxxxxx/
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