On Mon, Jun 28, 2010 at 12:16:06AM +0800, loody wrote: > Dear all: > AFAIK, wmb in mips is implemented by calling sync, > wmb->fast_wmb->__sync, which makes sure Loads and stores executed > before the SYNC are completed before loads > and stores after the SYNC can start > But will this instruction write the cache back too? No. > take usb example, it will call this maco before it let host processing > the commands on dram, so I wondering whether sync will write the cache > back to memory. SYNC is for memory consistency, not coherency. Ralf
