if_em, legacy nic and GbE saturation

2013-08-26 Thread Harald Schmalzbauer
Hello, I recycled an older box and put an i350-2 together with a second 82541GI (PCI-slot, one already on-board) into it. The two i350-ports are used with VMDq for ESXi5.1. The two 82541GI are used as lagg-nics by a 9.2-RC (amd64) guest as passthrou PCI device. Always had good results with such

Re: if_em, legacy nic and GbE saturation

2013-08-26 Thread Adrian Chadd
Hi, There's bus limits on how much data you can push over a PCI bus. You can look around online to see what 32/64 bit, 33/66MHz PCI throughput estimates are. It changes massively if you use small versus large frames as well. The last time I tried it i couldn't hit gige on PCI; I only managed to

Re: if_em, legacy nic and GbE saturation

2013-08-26 Thread Harald Schmalzbauer
Bezüglich Adrian Chadd's Nachricht vom 26.08.2013 10:34 (localtime): Hi, There's bus limits on how much data you can push over a PCI bus. You can look around online to see what 32/64 bit, 33/66MHz PCI throughput estimates are. It changes massively if you use small versus large frames as

Re: if_em, legacy nic and GbE saturation

2013-08-26 Thread Stefan Esser
Am 26.08.2013 11:28, schrieb Harald Schmalzbauer: Bezüglich Adrian Chadd's Nachricht vom 26.08.2013 10:34 (localtime): Hi, There's bus limits on how much data you can push over a PCI bus. You can look around online to see what 32/64 bit, 33/66MHz PCI throughput estimates are. It changes