passt/test/perf, branch bug165c

test: Update the threshold value for some perf tests

2025-10-15T21:16:38+00:00

The values are adjusted to better match results observerd on the
test hardware with 56-core Xeon Gold 6330 CPU and 126 GB RAM.

Link: https://bugs.passt.top/show_bug.cgi?id=156
Signed-off-by: Yumei Huang 
Reviewed-by: David Gibson 
Signed-off-by: Stefano Brivio

netlink: Don't require address to be global, just not link local

2025-09-30T10:03:39+00:00

nl_addr_get() will only pick up global IPv6 addresses (RT_SCOPE_UNIVERSE).
This is because link-local addresses aren't suitable.  However site-local
addresses (in the rare occassions they're used) would be fine for our
purposes.  In fact, anything wider than link scope is fine, so update the
check to reflect that.

Change the logic in the test scripts to match as well.

Reported-by: Xun Gu 
Link: https://bugs.passt.top/show_bug.cgi?id=122
Signed-off-by: David Gibson 
Signed-off-by: Stefano Brivio

perf/passt_vu_tcp: Make it shine

2024-11-28T14:06:44+00:00

Signed-off-by: Stefano Brivio

test: Add tests for passt in vhost-user mode

2024-11-27T15:49:21+00:00

Run functional and performance tests for vhost-user mode as well. For
functional tests, we add passt_vu and passt_vu_in_ns as symbolic links
to their non-vhost-user counterparts, as no differences are intended
but we want to distinguish them in test logs.

For performance tests, instead, we add separate perf/passt_vu_tcp and
perf/passt_vu_udp files, as we need longer test duration, as well as
higher UDP sending bandwidths and larger TCP windows, to actually get
the highest throughput vhost-user mode offers.

For valgrind tests, vhost-user mode needs two extra system calls:
statx and readlink. Add them as EXTRA_SYSCALLS for the valgrind
target.

Signed-off-by: Stefano Brivio 
Signed-off-by: Laurent Vivier 
Reviewed-by: David Gibson

test/perf: Select a single IPv6 namespace address in pasta tests

2024-11-26T07:30:18+00:00

By dropping the filter on prefix length, commit 910f4f910301
("test: Don't require 64-bit prefixes in perf tests") broke tests on
setups where two global unicast IPv6 addresses are available, which
is the typical case when the "host" is a VM running under passt with
addresses from SLAAC and DHCPv6, because two addresses will be
returned.

Pick the first one instead. We don't really care about the prefix
length, any of these addresses will work.

Fixes: 910f4f910301 ("test: Don't require 64-bit prefixes in perf tests")
Link: https://archives.passt.top/passt-dev/20241119214344.6b4a5b3a@elisabeth/
Signed-off-by: Stefano Brivio 
Reviewed-by: David Gibson

test: Don't require 64-bit prefixes in perf tests

2024-11-07T11:47:34+00:00

When determining the namespace's IPv6 address in the perf test setup, we
explicitly filter for addresses with a 64-bit prefix length.  There's no
real reason we need that - as long as it's a global address we can use it.
I suspect this was copied without thinking from a similar example in the
NDP tests, where the 64-bit prefix length _is_ meaningful (though it's not
entirely clear if the handling is correct there either).

Signed-off-by: David Gibson 
Signed-off-by: Stefano Brivio

test: Wait for DAD on DHCPv6 addresses

2024-10-18T18:27:51+00:00

After running dhclient -6 we expect the DHCPv6 assigned address to be
immediately usable.  That's true with the Fedora dhclient-script (and the
upstream ISC DHCP one), however it's not true with the Debian
dhclient-script.  The Debian script can complete with the address still
in "tentative" state, and the address won't be usable until Duplicate
Address Detection (DAD) completes.  That's arguably a bug in Debian (see
link below), but for the time being we need to work around it anyway.

We usually get away with this, because by the time we do anything where the
address matters, DAD has completed.  However, it's not robust, so we should
explicitly wait for DAD to complete when we get an DHCPv6 address.

Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1085231

Signed-off-by: David Gibson 
Signed-off-by: Stefano Brivio

conf: Allow address remapped to host to be configured

2024-08-21T10:00:35+00:00

Because the host and guest share the same IP address with passt/pasta, it's
not possible for the guest to directly address the host.  Therefore we
allow packets from the guest going to a special "NAT to host" address to be
redirected to the host, appearing there as though they have both source and
destination address of loopback.

Currently that special address is always the address of the default
gateway (or none).  That can be a problem if we want that gateway to be
addressable by the guest.  Therefore, allow the special "NAT to host"
address to be overridden on the command line with a new --map-host-loopback
option.

In order to exercise and test it, update the passt_in_ns and perf
tests to use this option and give different mapping addresses for the
two layers of the environment.

Signed-off-by: David Gibson 
Signed-off-by: Stefano Brivio

test: Reconfigure IPv6 address after changing MTU

2024-08-21T10:00:33+00:00

In the TCP throughput tests, we adjust the guest's MTU in order to test
various packet sizes.  Some of those are below 1280 which causes IPv6 to
be deconfigured on the guest interface.  When we increase it above 1280
again, IPv6 is re-enabled and we get an address in the right prefix with
NDP, but we don't get exactly the expected address back - that's only
communicated with --config-net or DHCPv6.

With changes to how we handle NAT this can cause some of the IPv6 tests to
fail, because they don't use the address that passt/pasta expects, and the
guest doesn't initiate any traffic which allows us to learn what the new
address is.

Work around this by re-invoking dhclient -6 between adjusting the MTU and
running IPv6 test cases.

Signed-off-by: David Gibson 
Signed-off-by: Stefano Brivio

test: Speed up by cutting on eye candy and performance test duration

2024-08-15T07:13:15+00:00

We have a number of delays when we switch to new layouts that were
added to make the tests visually easier to follow, together with
blinking status bars. Shorten the delays and avoid blinking the
status bar if $FAST is set to 1 (no demo mode).

Shorten delays in busy loops to 10ms, instead of 100ms, and skip the
one-second fixed delay when we wait for the status of a command.

Cut the duration of throughput and latency tests to one second, down
from ten. Somewhat surprisingly, the results we get are rather
consistent, and not significantly different from what we'd get with
10 seconds.

This, together with Podman's commit 20f3e8909e3a ("test/system:
pasta_test_do add explicit port check"), cuts the time needed on my
setup for full test run from approximately 37 minutes to...:

  $ time ./run
  [exited]
  PASS: 165, FAIL: 0
  Log at /home/sbrivio/passt/test/test_logs/test.log

  real	15m34.253s
  user	0m0.011s
  sys	0m0.011s

Signed-off-by: Stefano Brivio 
Reviewed-by: David Gibson 
Tested-by: David Gibson