diff options
Diffstat (limited to 'src/runtime/proc.go')
| -rw-r--r-- | src/runtime/proc.go | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/src/runtime/proc.go b/src/runtime/proc.go index db7a5b2bb1..44c6d0b4e4 100644 --- a/src/runtime/proc.go +++ b/src/runtime/proc.go @@ -3387,8 +3387,12 @@ top: // blocked thread (e.g. it has already returned from netpoll, but does // not set lastpoll yet), this thread will do blocking netpoll below // anyway. - if netpollinited() && netpollAnyWaiters() && sched.lastpoll.Load() != 0 { - if list, delta := netpoll(0); !list.empty() { // non-blocking + // We only poll from one thread at a time to avoid kernel contention + // on machines with many cores. + if netpollinited() && netpollAnyWaiters() && sched.lastpoll.Load() != 0 && sched.pollingNet.Swap(1) == 0 { + list, delta := netpoll(0) + sched.pollingNet.Store(0) + if !list.empty() { // non-blocking gp := list.pop() injectglist(&list) netpollAdjustWaiters(delta) |