On Tue, 8 Aug 2017 09:44:56 +0800 Bob Chen <a175818...@gmail.com> wrote:
> 1. How to test the KVM exit rate? You can use tracing: http://www.linux-kvm.org/page/Tracing > 2. The switches are separate devices of PLX Technology > > # lspci -s 07:08.0 -nn > 07:08.0 PCI bridge [0604]: PLX Technology, Inc. PEX 8747 48-Lane, 5-Port > PCI Express Gen 3 (8.0 GT/s) Switch [10b5:8747] (rev ca) > > # This is one of the Root Ports in the system. > [0000:00]-+-00.0 Intel Corporation Xeon E7 v4/Xeon E5 v4/Xeon E3 v4/Xeon D > DMI2 > +-01.0-[01]----00.0 LSI Logic / Symbios Logic MegaRAID SAS > 2208 [Thunderbolt] > +-02.0-[02-05]-- > +-03.0-[06-09]----00.0-[07-09]--+-08.0-[08]--+-00.0 NVIDIA > Corporation GP102 [TITAN Xp] > | | \-00.1 NVIDIA > Corporation GP102 HDMI Audio Controller > | \-10.0-[09]--+-00.0 NVIDIA > Corporation GP102 [TITAN Xp] > | \-00.1 NVIDIA > Corporation GP102 HDMI Audio Controller > > > > > 3. ACS > > It seemed that I had misunderstood your point? I finally found ACS > information on switches, not on GPUs. > > Capabilities: [f24 v1] Access Control Services > ACSCap: SrcValid+ TransBlk+ ReqRedir+ CmpltRedir+ UpstreamFwd+ EgressCtrl+ > DirectTrans+ > ACSCtl: SrcValid+ TransBlk- ReqRedir+ CmpltRedir+ UpstreamFwd+ EgressCtrl- > DirectTrans- Yes, NVIDIA uses the same PLX PEX 8747 on the switches on the cards I have access to. Unfortunately the endpoints in my case do not support ATS, so the endpoint cannot generate a pre-translated address that would take advantage of the DT capability on the switch port if we were to enable it. Thanks, Alex
