[Bug 235031] [em] em0: poor NFS performance, strange behavior

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235031

--- Comment #40 from Marko Cupać <marko.cupac at mimar.rs> ---
Hi,

I just got advice to try and disable LRO on em0 interface with base driver, and
it resulted in acceptable performance in my VirtualBox VMs with bridged
networking.

I noticed different options between the two drivers:

if_em:
options=81249b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,LRO,WOL_MAGIC,VLAN_HWFILTER>

if_em_updated: 
options=4219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC,VLAN_HWTSO>

The difference is that if_em_updated has TSO4 and not LRO, also VLAN_HWTSO and
not VLAN_HWFILTER

I am back to if_em_updated for now, but hopefully this information will be
helpful in fixing if_em.

Regards,

-- 
You are receiving this mail because:
You are the assignee for the bug.