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Implement exponential backoff in vrf plugin

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The current max waiting time for global IPV6 addresses
to be present in the kernel after reinserting them is not
sufficient for all use cases. SRIOV + VRF takes around 1.2s.

These changes increase the maximum waiting time to approximately
2.5s. An exponential backoff is implemented to reduce cpu overload.

Signed-off-by: Marcelo Guerrero <marguerr@redhat.com>
This commit is contained in:
Marcelo Guerrero
2025-03-28 18:21:36 +01:00
committed by Casey Callendrello
parent 062b3fceb4
commit f859b730da
1 changed files with 7 additions and 5 deletions
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12
plugins/meta/vrf/vrf.go
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@@ -156,8 +156,9 @@ CONTINUE:
}
// Waits for global IPV6 addresses to be added by the kernel.
maxRetry := 10
for {
backoffBase := 10 * time.Millisecond
maxRetries := 8
for retryCount := 0; retryCount <= maxRetries; retryCount++ {
routesVRFTable, err := netlinksafe.RouteListFiltered(
netlink.FAMILY_ALL,
&netlink.Route{
@@ -178,12 +179,13 @@ CONTINUE:
break
}
maxRetry--
if maxRetry <= 0 {
if retryCount == maxRetries {
return fmt.Errorf("failed getting local/host addresses for %s in table %d with dst %s", intf, vrf.Table, toFind.IPNet.String())
}
time.Sleep(10 * time.Millisecond)
// Exponential backoff - 10ms, 20m, 40ms, 80ms, 160ms, 320ms, 640ms, 1280ms
// Approx 2,5 seconds total
time.Sleep(backoffBase * time.Duration(1<<retryCount))
}
}