Re: Poor USB2 performance on G4 Mac Mini - expected?

"Jonathan A. Kollasch" <[email protected]> Sun, 18 Oct 2020 08:45:45 -0500

Newsgroups	gmane.os.netbsd.ports.macppc
Message-ID	<[email protected]>

On Fri, Oct 16, 2020 at 04:07:57PM +1100, James Haggerty wrote:
> Hi,
> 
> I'm finding that I can get at most aound 60mbps from the USB2 ports on
> my Mac Mini G4. For example:
> 
> # dd if=/dev/sd0c of=/dev/null bs=1024k count=100

Try the character device /dev/rsd0c instead.

The block device supports byte-oriented access via read/modify/write,
but accesses the drive in BLKDEV_IOSIZE (usually 2KiB) chunks.

The character device supports logical block-aligned accesses up
to MAXPHYS bytes (usually 64KiB) in size each.