freebsd stable - Apr 2019 - em performs worse than igb (latency wise) in 12?

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.

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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