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dhcp ipam: add fast retry

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Almost every first retry of DHCP will fail due to interface is not up. Add a
fast retry to reduce unnecessary latency.

Signed-off-by: SilverBut <SilverBut@users.noreply.github.com>
This commit is contained in:
SilverBut 2021-10-02 23:04:24 +08:00
parent 2bebd89aa2
commit 4b216e9d9b
1 changed files with 7 additions and 1 deletions
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8
plugins/ipam/dhcp/lease.go
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@ -423,6 +423,7 @@ func jitter(span time.Duration) time.Duration {
func backoffRetry(resendMax time.Duration, f func() (*dhcp4.Packet, error)) (*dhcp4.Packet, error) {
var baseDelay time.Duration = resendDelay0
var sleepTime time.Duration
var fastRetryLimit = 3 // fast retry for 3 times to speed up
for {
pkt, err := f()
@ -432,7 +433,12 @@ func backoffRetry(resendMax time.Duration, f func() (*dhcp4.Packet, error)) (*dh
log.Print(err)
sleepTime = baseDelay + jitter(time.Second)
if fastRetryLimit == 0 {
sleepTime = baseDelay + jitter(time.Second)
} else {
sleepTime = jitter(time.Second)
fastRetryLimit--
}
log.Printf("retrying in %f seconds", sleepTime.Seconds())