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| author | Maxime Chevallier <maxime.chevallier@bootlin.com> | 2024-11-22 17:12:55 +0300 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2024-11-26 13:58:12 +0300 |
| commit | 407618d66dba55e7db1278872e8be106808bbe91 (patch) | |
| tree | dd5f38085954733bc54d411ecb025c3fd10fd73d /tools/perf/scripts/python/parallel-perf.py | |
| parent | b032ae57d4fe2b2445e3bc190db6fcaa8c102f68 (diff) | |
| download | linux-407618d66dba55e7db1278872e8be106808bbe91.tar.xz | |
net: stmmac: dwmac-socfpga: Set RX watchdog interrupt as broken
On DWMAC3 and later, there's a RX Watchdog interrupt that's used for
interrupt coalescing. It's known to be buggy on some platforms, and
dwmac-socfpga appears to be one of them. Changing the interrupt
coalescing from ethtool doesn't appear to have any effect here.
Without disabling RIWT (Received Interrupt Watchdog Timer, I
believe...), we observe latencies while receiving traffic that amount to
around ~0.4ms. This was discovered with NTP but can be easily reproduced
with a simple ping. Without this patch :
64 bytes from 192.168.5.2: icmp_seq=1 ttl=64 time=0.657 ms
With this patch :
64 bytes from 192.168.5.2: icmp_seq=1 ttl=64 time=0.254 ms
Fixes: 801d233b7302 ("net: stmmac: Add SOCFPGA glue driver")
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20241122141256.764578-1-maxime.chevallier@bootlin.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'tools/perf/scripts/python/parallel-perf.py')
0 files changed, 0 insertions, 0 deletions