[Intel-wired-lan] Decreasing time to get link up to below 3 s
pmenzel at molgen.mpg.de
Fri May 31 13:19:20 UTC 2019
Dear Linux folks,
On several systems with different network devices and drivers (e1000e, r8169, tg3)
it looks like getting the link up takes over three seconds.
### e1000e ###
[ 1.999678] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
[ 2.000374] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
[ 2.001206] e1000e 0000:00:1f.6: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode
[ 2.412096] e1000e 0000:00:1f.6 0000:00:1f.6 (uninitialized): registered PHC clock
[ 2.495295] e1000e 0000:00:1f.6 eth0: (PCI Express:2.5GT/s:Width x1) 64:00:6a:2c:10:c1
[ 2.496204] e1000e 0000:00:1f.6 eth0: Intel(R) PRO/1000 Network Connection
[ 2.497024] e1000e 0000:00:1f.6 eth0: MAC: 12, PHY: 12, PBA No: FFFFFF-0FF
[ 15.614031] e1000e 0000:00:1f.6 net00: renamed from eth0
[ 18.679325] e1000e: net00 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
### r8169 ###
[ 33.433103] r8169 0000:18:00.0: enabling device (0000 -> 0003)
[ 33.453834] libphy: r8169: probed
[ 33.456629] r8169 0000:18:00.0 eth0: RTL8168h/8111h, 30:9c:23:04:d6:98, XID 541, IRQ 52
[ 33.456631] r8169 0000:18:00.0 eth0: jumbo features [frames: 9200 bytes, tx checksumming: ko]
[ 33.607384] r8169 0000:18:00.0 enp24s0: renamed from eth0
[ 34.134035] Generic Realtek PHY r8169-1800:00: attached PHY driver [Generic Realtek PHY] (mii_bus:phy_addr=r8169-1800:00, irq=IGNORE)
[ 34.215244] r8169 0000:18:00.0 enp24s0: Link is Down
[ 37.822536] r8169 0000:18:00.0 enp24s0: Link is Up - 1Gbps/Full - flow control rx/tx
### tg3 ###
[ 2.015604] tg3.c:v3.137 (May 11, 2014)
[ 2.025613] tg3 0000:04:00.0 eth0: Tigon3 [partno(BCM95762) rev 5762100] (PCI Express) MAC address 54:bf:64:70:a5:f9
[ 2.026955] tg3 0000:04:00.0 eth0: attached PHY is 5762C (10/100/1000Base-T Ethernet) (WireSpeed, EEE)
[ 2.028252] tg3 0000:04:00.0 eth0: RXcsums LinkChgREG MIirq ASF TSOcap
[ 2.029462] tg3 0000:04:00.0 eth0: dma_rwctrl dma_mask[64-bit]
[ 6.376904] tg3 0000:04:00.0 net00: renamed from eth0
[ 10.240411] tg3 0000:04:00.0 net00: Link is up at 1000 Mbps, full duplex
[ 10.240412] tg3 0000:04:00.0 net00: Flow control is on for TX and on for RX
[ 10.240413] tg3 0000:04:00.0 net00: EEE is disabled
Can you verify, that it takes that long on your systems too?
Can this be improved? According to the thread *Ethernet auto-negotiate time* 
it should take not more that half a second.
If the time cannot be decreased, are there alternative strategies to get a link
up as fast as possible? For fast boot systems, it’d be interesting if first
a slower speed could be negotiated and later it would be changed.
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