Hi Chuck, On 07/09/2015 04:41 PM, Chuck Lever wrote: > The point of larger rsize and wsize is to reduce the per-byte cost > of memory registration and deregistration. Modern HCAs can typically > handle a megabyte or more with a single registration operation. > > Signed-off-by: Chuck Lever <[email protected]> > --- > net/sunrpc/xprtrdma/xprt_rdma.h | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h > index f49dd8b..abee472 100644 > --- a/net/sunrpc/xprtrdma/xprt_rdma.h > +++ b/net/sunrpc/xprtrdma/xprt_rdma.h > @@ -165,8 +165,7 @@ rdmab_to_msg(struct rpcrdma_regbuf *rb) > * struct rpcrdma_buffer. N is the max number of outstanding requests. > */ > > -/* temporary static scatter/gather max */ > -#define RPCRDMA_MAX_DATA_SEGS (64) /* max scatter/gather */ > +#define RPCRDMA_MAX_DATA_SEGS ((1 * 1024 * 1024) / PAGE_SIZE) ^^^ What is the significance of the 1 here?
Thanks, Anna > #define RPCRDMA_MAX_SEGS (RPCRDMA_MAX_DATA_SEGS + 2) /* head+tail = 2 */ > > struct rpcrdma_buffer; > > -- > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
