Run1:


Normal r8169:

[ 1686.594606] In init module.
[ 1686.658162] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
[ 1686.658180] r8169 0000:03:02.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
[ 1686.658294] r8169 0000:03:02.0: no PCI Express capability
[ 1686.661042] eth1: RTL8169sc/8110sc at 0xffffc20011094f00, 00:0a:cd:17:f4:b6, XID 18000000 IRQ 18
[ 1686.923581] r8169: eth1: link down
[ 1686.924412] ADDRCONF(NETDEV_UP): eth1: link is not ready

[ 1730.430897] Starting to exit mdoule
[ 1730.528458] r8169 0000:03:02.0: PCI INT A disabled
[ 1730.528505] Done with exit module.

0.33 + 0.1 = 0.43s

r8169 ondemnad:

[ 1139.177312] SFI failed.
[ 1139.236038] *****Killing rtl8169_get_wol 0. 

0.06 s

Run2 :


[ 3363.384230] In init module.
[ 3363.447676] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
[ 3363.575887] r8169 0000:03:02.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
[ 3363.734545] r8169 0000:03:02.0: no PCI Express capability
[ 3363.861157] eth1: RTL8169sc/8110sc at 0xffffc2000066cf00, 00:0a:cd:17:f4:b6, XID 18000000 IRQ 18
[ 3364.225074] r8169: eth1: link down
[ 3364.303425] ADDRCONF(NETDEV_UP): eth1: link is not ready


[ 3407.496010] Starting to exit mdoule
[ 3407.593047] r8169 0000:03:02.0: PCI INT A disabled
[ 3407.704563] Done with exit module.

0.9 + 0.2 = 1.1

[ 1613.039223] SFI failed.
[ 1613.097920] *****Killing rtl8169_get_wol 0. 

0.058s



Run3:

[ 3511.252739] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
[ 3511.381076] r8169 0000:03:02.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
[ 3511.539501] r8169 0000:03:02.0: no PCI Express capability
[ 3511.663960] eth1: RTL8169sc/8110sc at 0xffffc20000668f00, 00:0a:cd:17:f4:b6, XID 18000000 IRQ 18
[ 3512.032555] r8169: eth1: link down
[ 3512.111465] ADDRCONF(NETDEV_UP): eth1: link is not ready
[ 3521.190424] Starting to exit mdoule
[ 3521.286955] r8169 0000:03:02.0: PCI INT A disabled
[ 3521.396688] Done with exit module.


0.8 + 0.1 = 0.9 s

on demand recovery:

(This was a brutal stack corruption)

It cause a page fault and was trapped by page fault handlers there..
[ 3076.505986] page fault trap recorded.
[ 3076.589979] ethtool[25124]  ip:ffffffff80349f5b sp:ffff8800cec91a10 error:2 SFI failed. making note.

We however, note from the start to end of recovery.

[ 3076.801159] Recovery start
[ 3076.865841] *****Killing rtl8169_get_drvinfo 0. 

0.065 s


Checkpoint latency:

Checkpoint 26 microseconds

Restore 30 micro seconds
=========================

recovery time lapse: 35 micro-secomds
recovery time lapse: 33 micro-secomds
recovery time lapse: 34 micro-secomds