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Refactor netstack to use bufferv2 instead of buffer.

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This change has significant performance implications. bufferv2 is reference
counted and pooled, which alleviates heap/GC pressure. Below are the results
from running the iperf benchmark.

HEAD:
BenchmarkIperf/operation.Upload-16    1552  ns/op   46.6GiB total allocations
BenchmarkIperf/operation.Download-16  1114  ns/op   68.6GiB total allocations

w/ change:
BenchmarkIperf/operation.Upload-16    1139  ns/op (-27%)   1.41GiB total allocations (-97%)
BenchmarkIperf/operation.Download-16  753.2 ns/op (-33%)   706MiB  total allocations (-99%)

PiperOrigin-RevId: 462453185
This commit is contained in:
Lucas Manning
2022-07-21 13:09:31 -07:00
committed by gVisor bot
parent da267f435f
commit 1f2b30d70c
137 changed files with 2603 additions and 2089 deletions
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pkg/sentry/socket/netstack/netstack.go
+5 -2
View File
@@ -3001,14 +3001,17 @@ func (s *socketOpsCommon) recvErr(t *kernel.Task, dst usermem.IOSequence) (int,
if sockErr == nil {
return 0, 0, nil, 0, socket.ControlMessages{}, syserr.ErrTryAgain
}
if sockErr.Payload != nil {
defer sockErr.Payload.Release()
}
// The payload of the original packet that caused the error is passed as
// normal data via msg_iovec. -- recvmsg(2)
msgFlags := linux.MSG_ERRQUEUE
if int(dst.NumBytes()) < len(sockErr.Payload) {
if int(dst.NumBytes()) < sockErr.Payload.Size() {
msgFlags |= linux.MSG_TRUNC
}
n, err := dst.CopyOut(t, sockErr.Payload)
n, err := dst.CopyOut(t, sockErr.Payload.AsSlice())
// The original destination address of the datagram that caused the error is
// supplied via msg_name. -- recvmsg(2)