Re: RSS kernel and 1Gb network (10GB capable bxe)

Hi,

On Thu, Nov 05, 2026 at 08:40:49PM +0100, Jan Bramkamp wrote:

>The purpose of RSS is to spread the load of multiple flows on the same 
>interface among multiple CPU cores. For 1Gb/s that's not needed on 
>anything but the crappiest Atoms.

Thanks for the explanation.
Hardware is a HP Proliant Gen8. There's 2* xenon E5-2690 v2 @ 3.00GHz.
SHT is turned off (so there are 20 cores not 40).

The netifs on the motherboard are bxe0 and bxe1. bxe0 isn't plugged into
anything right now.

doas dmesg | ug bxe0
     75:	bxe0: <QLogic NetXtreme II BCM57810 10GbE (B0) BXE v:1.78.91> \
     mem 0xf6000000-0xf67fffff,0xf5800000-0xf5ffffff,0xf57f0000-0xf57fffff \
     irq 32 at device 0.0 numa-domain 0 on pci3
     76:	bxe0: PCI BAR0 [10] memory allocated: 0xf6000000-0xf67fffff \
     (8388608) -> 0xfffff800f6000000
     77:	bxe0: PCI BAR2 [18] memory allocated: 0xf5800000-0xf5ffffff \
     (8388608) -> 0xfffff800f5800000
     78:	bxe0: PCI BAR4 [20] memory allocated: 0xf57f0000-0xf57fffff \
     (65536) -> 0xfffff800f57f0000
     79:	bxe0: Found 10GBase-T media.
     80:	bxe0: IFMEDIA flags : 20
     81:	bxe0: Using defaults for TSO: 65518/35/2048
     82:	bxe0: Ethernet address: re:da:ct:ed
     83:	bxe0: MSI-X vectors Requested 5 and Allocated 5

>Are you using FreeBSD bhyve as your hypervisor and if so how does your 
>network configuration look like? Does your NIC support SR-IOV? Do you 
>need network isolation between your VMs?

Not sure about SR-IOV. How can I check?

# ifconfig bxe0
bxe0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
         options=527bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM, \
         TSO4,TSO6,LRO,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO>
         ether re:da:cd:ed
         media: Ethernet autoselect (none)
         status: no carrier
         nd6 options=829<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL,STABLEADDR>

yes, am using bhyve hypervisor for some freebsd guests, an openbsd one, a netbsd one
and also ubuntu. Yes, I also need network isolation (to the extent that each vm 
has its own IP. some have real IPs, others are in private ip ranges).

Thanks for answering,
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