On Fri, Mar 14, 2014 at 11:34:31PM -0400, Theodore Ts'o wrote: > The current virtio block sets a queue depth of 64, which is > insufficient for very fast devices. It has been demonstrated that > with a high IOPS device, using a queue depth of 256 can double the > IOPS which can be sustained. > > As suggested by Venkatash Srinivas, set the queue depth by default to > be one half the the device's virtqueue, which is the maximum queue > depth that can be supported by the channel to the host OS (each I/O > request requires at least two VQ entries).
I don't think this should be a module parameter. The default sizing should be based of the parameters of the actual virtqueue, and if we want to allow tuning it it should be by a sysfs attribute, preferable using the same semantics as SCSI. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
