Increasing the default slot table entries will increase the MR requirements per mount. Currently, with 32 as default Client ends up allocating 2178 frmrs (ref: kernel 4.1-rc4) for a single mount. With 128 frmr requirement for startup would be 8448. 8K+ MRs per mount just for start-up, I am a little doubtful about this change. We can always release-note that "for better performance increase the slot table entries by echo 128 > /proc/sys/sunrpc/rdma_slot_table_entries" -Regards Devesh On Fri, Jul 10, 2015 at 2:12 AM, Chuck Lever <chuck.lever@xxxxxxxxxx> wrote: > In preparation for similar increases on NFS/RDMA servers, bump the > advertised credit limit for RPC/RDMA to 128. This allocates some > extra resources, but the client will continue to allow only the > number of RPCs in flight that the server requests via its advertised > credit limit. > > Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx> > --- > include/linux/sunrpc/xprtrdma.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/linux/sunrpc/xprtrdma.h b/include/linux/sunrpc/xprtrdma.h > index b176130..b7b279b 100644 > --- a/include/linux/sunrpc/xprtrdma.h > +++ b/include/linux/sunrpc/xprtrdma.h > @@ -49,7 +49,7 @@ > * a single chunk type per message is supported currently. > */ > #define RPCRDMA_MIN_SLOT_TABLE (2U) > -#define RPCRDMA_DEF_SLOT_TABLE (32U) > +#define RPCRDMA_DEF_SLOT_TABLE (128U) > #define RPCRDMA_MAX_SLOT_TABLE (256U) > > #define RPCRDMA_DEF_INLINE (1024) /* default inline max */ > > -- > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
