diff options
| author | Yajun Deng <yajun.deng@linux.dev> | 2023-04-21 16:26:06 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-04-23 14:18:05 +0100 |
| commit | 2f0f9465ad9fa9c93f30009184c10da0f504f313 (patch) | |
| tree | 9b89ff45b393c5d1874d58d2dd054ca23d7a3a73 /net/sched | |
| parent | 00266b365d2b5a7ab4c9fa300784607d5770f8bc (diff) | |
| download | linux-2f0f9465ad9fa9c93f30009184c10da0f504f313.tar.gz | |
net: sched: Print msecs when transmit queue time out
The kernel will print several warnings in a short period of time
when it stalls. Like this:
First warning:
[ 7100.097547] ------------[ cut here ]------------
[ 7100.097550] NETDEV WATCHDOG: eno2 (xxx): transmit queue 8 timed out
[ 7100.097571] WARNING: CPU: 8 PID: 0 at net/sched/sch_generic.c:467
dev_watchdog+0x260/0x270
...
Second warning:
[ 7147.756952] rcu: INFO: rcu_preempt self-detected stall on CPU
[ 7147.756958] rcu: 24-....: (59999 ticks this GP) idle=546/1/0x400000000000000
softirq=367 3137/3673146 fqs=13844
[ 7147.756960] (t=60001 jiffies g=4322709 q=133381)
[ 7147.756962] NMI backtrace for cpu 24
...
We calculate that the transmit queue start stall should occur before
7095s according to watchdog_timeo, the rcu start stall at 7087s.
These two times are close together, it is difficult to confirm which
happened first.
To let users know the exact time the stall started, print msecs when
the transmit queue time out.
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/sch_generic.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index a9aadc4e68581..37e41f972f69f 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -502,7 +502,7 @@ static void dev_watchdog(struct timer_list *t) if (netif_device_present(dev) && netif_running(dev) && netif_carrier_ok(dev)) { - int some_queue_timedout = 0; + unsigned int timedout_ms = 0; unsigned int i; unsigned long trans_start; @@ -514,16 +514,16 @@ static void dev_watchdog(struct timer_list *t) if (netif_xmit_stopped(txq) && time_after(jiffies, (trans_start + dev->watchdog_timeo))) { - some_queue_timedout = 1; + timedout_ms = jiffies_to_msecs(jiffies - trans_start); atomic_long_inc(&txq->trans_timeout); break; } } - if (unlikely(some_queue_timedout)) { + if (unlikely(timedout_ms)) { trace_net_dev_xmit_timeout(dev, i); - WARN_ONCE(1, KERN_INFO "NETDEV WATCHDOG: %s (%s): transmit queue %u timed out\n", - dev->name, netdev_drivername(dev), i); + WARN_ONCE(1, "NETDEV WATCHDOG: %s (%s): transmit queue %u timed out %u ms\n", + dev->name, netdev_drivername(dev), i, timedout_ms); netif_freeze_queues(dev); dev->netdev_ops->ndo_tx_timeout(dev, i); netif_unfreeze_queues(dev); |