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Reduce PACKET_RX_RING memory usage

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Previous memory allocation was excessive (80 MB). Changed
it to use 2 MB instead. There is no drop in perfomance due
to this change:

ab -n 100 -c 10 http://server/latin10m.txt  ==> 10 MB file
80 MB: 178 MB/s
 2 MB: 181 MB/s

PiperOrigin-RevId: 238321594
Change-Id: I1c8aed13cad5d75f4506d2b406b305117055fbe5
This commit is contained in:
Fabricio Voznika
2019-03-13 15:25:13 -07:00
committed by Shentubot
parent dfbd3c6e4a
commit 70d0613444
1 changed files with 4 additions and 2 deletions
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pkg/tcpip/link/fdbased/mmap_amd64_unsafe.go
+4 -2
View File
@@ -40,11 +40,13 @@ const (
// We overallocate the frame size to accommodate space for the
// TPacketHdr+RawSockAddrLinkLayer+MAC header and any padding.
//
// Memory allocated for the ring buffer: tpBlockSize * tpBlockNR = 2 MiB
//
// NOTE: Frames need to be aligned at 16 byte boundaries.
const (
tpFrameSize = 65536 + 128
tpBlockSize = tpFrameSize * 128
tpBlockNR = 10
tpBlockSize = tpFrameSize * 32
tpBlockNR = 1
tpFrameNR = (tpBlockSize * tpBlockNR) / tpFrameSize
)