On Wed, Nov 15, 2017 at 03:10:30PM +0200, Yishai Hadas wrote: > The man page was updated with a detailed description on the above > capability, see PR: > https://github.com/linux-rdma/rdma-core/pull/250 Yah, that is nicer Here is some copy-editing: Extended device capability flags (device_cap_flags_ex): .br .TP 7 IBV_DEVICE_PCI_WRITE_END_PADDING Indicates the device has support for padding PCI writes to a full cache line. Padding packets to full cache lines reduces the amount of traffic required at the memory controller at the expense of creating more traffic on the PCI-E port. Workloads that have a high CPU memory load and low PCI-E utilization will benefit from this feature, while workloads that have a high PCI-E utilization and small packets will be harmed. For instance, with a 128 byte cache line size, the transfer of any packets less than 128 bytes will require a full 128 transfer on PCI, pontentially doubling the required PCI-E bandwith. This feature can be enabled on a QP or WQ basis via the IBV_QP_CREATE_PCI_WRITE_END_PADDING or IBV_WQ_FLAGS_PCI_WRITE_END_PADDING flags. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
