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net: make napi_threaded_poll() aware of sd->defer_list

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If we call skb_defer_free_flush() from napi_threaded_poll(),
we can avoid to raise IPI from skb_attempt_defer_free()
when the list becomes too big.

This allows napi_threaded_poll() to rely less on softirqs,
and lowers latency caused by a too big list.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2023-04-21 09:43:56 +00:00 committed by David S. Miller
parent e6f50edfef
commit a1aaee7f8f
1 changed files with 3 additions and 0 deletions
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3
net/core/dev.c
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@ -6622,6 +6622,7 @@ static void skb_defer_free_flush(struct softnet_data *sd)
static int napi_threaded_poll(void *data)
{
struct napi_struct *napi = data;
struct softnet_data *sd;
void *have;
while (!napi_thread_wait(napi)) {
@ -6629,11 +6630,13 @@ static int napi_threaded_poll(void *data)
bool repoll = false;
local_bh_disable();
sd = this_cpu_ptr(&softnet_data);
have = netpoll_poll_lock(napi);
__napi_poll(napi, &repoll);
netpoll_poll_unlock(have);
skb_defer_free_flush(sd);
local_bh_enable();
if (!repoll)