Hi Chuck,
On 08/23/2016 01:54 PM, Chuck Lever wrote:
> RPC-over-RDMA Version Two will likely require at least a 4KB inline
> threshold by default. The Version One inline threshold is still 1KB,
> and it's automatically negotiated down to in
> rpcrdma_update_connect_private.
I'm curious, what is the status of RPCoRDMA v2?
Thanks,
Anna
>
> The maximum is somewhat arbitrary. There's no fundamental
> architectural limit I'm aware of, but it's good to keep the size of
> Receive buffers reasonable. Now that Send can use a s/g list, a
> Send buffer is only as large as each RPC requires. Receive buffers
> are always the size of the inline threshold, however.
>
> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
> ---
> include/linux/sunrpc/xprtrdma.h | 4 ++--
> net/sunrpc/xprtrdma/transport.c | 4 ++--
> 2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/sunrpc/xprtrdma.h b/include/linux/sunrpc/xprtrdma.h
> index 39267dc..221b7a2 100644
> --- a/include/linux/sunrpc/xprtrdma.h
> +++ b/include/linux/sunrpc/xprtrdma.h
> @@ -53,8 +53,8 @@
> #define RPCRDMA_MAX_SLOT_TABLE (256U)
>
> #define RPCRDMA_MIN_INLINE (1024) /* min inline thresh */
> -#define RPCRDMA_DEF_INLINE (1024) /* default inline thresh */
> -#define RPCRDMA_MAX_INLINE (3068) /* max inline thresh */
> +#define RPCRDMA_DEF_INLINE (4096) /* default inline thresh */
> +#define RPCRDMA_MAX_INLINE (65536) /* max inline thresh */
>
> /* Memory registration strategies, by number.
> * This is part of a kernel / user space API. Do not remove. */
> diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
> index 6a358ab..ed5e285 100644
> --- a/net/sunrpc/xprtrdma/transport.c
> +++ b/net/sunrpc/xprtrdma/transport.c
> @@ -97,7 +97,7 @@ static struct ctl_table xr_tunables_table[] = {
> .data = &xprt_rdma_max_inline_read,
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> - .proc_handler = proc_dointvec,
> + .proc_handler = proc_dointvec_minmax,
> .extra1 = &min_inline_size,
> .extra2 = &max_inline_size,
> },
> @@ -106,7 +106,7 @@ static struct ctl_table xr_tunables_table[] = {
> .data = &xprt_rdma_max_inline_write,
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> - .proc_handler = proc_dointvec,
> + .proc_handler = proc_dointvec_minmax,
> .extra1 = &min_inline_size,
> .extra2 = &max_inline_size,
> },
>
> --
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