em performs worse than igb (latency wise) in 12?

[Graham Menhennitt]

Not that it's at all relevant to the question here, but...

It does mostly work without em in the 12 kernel - I'm not sure how, but 
it does.

I upgraded to 12-stable via source but didn't add em to my custom 
kernel. Most things worked - basic network functionality. But I had 
problems with ipfw and igb. Adding em to the kernel fixed them.

Graham

On 6/4/19 6:12 am, Kris von Mach wrote:
> On 4/6/2019 2:56 AM, Pete French wrote:
>> Something odd going on there there - I am using 12-STABLE and I have 
>> igb just fine, and it attaches to the same hardware that 11 did:
>
> It does work in 12, throughput is great, just that the latency is 
> higher than 11.
>
> igb0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 
> 1500
> options=e527bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6> 
>
>         ether 38:ea:a7:8d:c1:6c
>         inet 208.72.56.19 netmask 0xfffffc00 broadcast 208.72.59.255
>         inet6 fe80::3aea:a7ff:fe8d:c16c%igb0 prefixlen 64 scopeid 0x1
>         inet6 2602:ffb8::208:72:56:9 prefixlen 64
>         media: Ethernet autoselect (1000baseT <full-duplex>)
>         status: active
>         nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
>
>> Do you have a custom kernel, and if so did you see this note in 
>> UPDATING?
>
> Yes I do, but it includes all of GENERIC which includes em drivers, 
> otherwise it wouldn't even work with the network card.
>
> my custom kernel:
>
> include GENERIC
> ident   CUSTOM
> makeoptions WITH_EXTRA_TCP_STACKS=1
> options TCPHPTS
> options SC_KERNEL_CONS_ATTR=(FG_GREEN|BG_BLACK)
> options IPSTEALTH
> options       AHC_REG_PRETTY_PRINT  # Print register bitfields in debug
> options       AHD_REG_PRETTY_PRINT  # Print register bitfields in debug
> device cryptodev
> device aesni
>
> I did try without RACK just in case that was the culprit.
>
>
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