Sockets stuck in SYN_RCVD (re(4), RELENG_7, i386)

韓家標 Bill Hacker askbill at
Wed Nov 21 02:11:12 PST 2007

Oliver Fromme wrote:


> I would like to ask everybody to have a look at the
> output from "sysctl net.inet.tcp.syncache.count".
> Does anybody else have a non-zero value that slowly
> increases?  If so, it would be interesting to find out
> if there are any similarities with my machine.

Zero count on:

7-BETA1 i386 of 20 October w/SCHED-ULE, otherwise vanilla, on GigaByte GA 
G33-DS3R, Core-2 Quad 2.4, 2 GB DDR-800.

Production use, varnishd on that NIC accelerating a WinServer website running in 
Qemu to an internal IP on fxp0 NIC -> Linksys firewall --> another frontside 
IP:port, thence picked up by varnisd and served 'publically' over the RealTek 
NIC (below).


re0: <RealTek 8168/8111B PCIe Gigabit Ethernet> port 0xc000-0xc0ff mem 
0xf1000000-0xf1000fff irq 16 at device 0.0 on pci3
re0: Using 2 MSI messages
miibus0: <MII bus> on re0
rgephy0: <RTL8169S/8110S media interface> PHY 1 on miibus0
rgephy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 
1000baseT-FDX, auto
re0: Ethernet address: 00:1a:4d:4e:22:e8
re0: [FILTER]
re0: [FILTER]


fxp0 is promiscuous for tun/tap.  re0 is vanilla.


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