[src/trunk]: src/sys/dev/pci Adjust the default descriptor sizes for ixl(4)

[yamaguchi <yamaguchi%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/5951dbce3300
branches:  trunk
changeset: 942777:5951dbce3300
user:      yamaguchi <yamaguchi%NetBSD.org@localhost>
date:      Wed Aug 19 09:07:57 2020 +0000

description:
Adjust the default descriptor sizes for ixl(4)

These decreasements has no impact for throughput
while forwarding 64-1518 byte packets.

diffstat:

 sys/dev/pci/if_ixl.c |  8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diffs (29 lines):

diff -r 8a28ccc7a07d -r 5951dbce3300 sys/dev/pci/if_ixl.c
--- a/sys/dev/pci/if_ixl.c      Wed Aug 19 09:03:50 2020 +0000
+++ b/sys/dev/pci/if_ixl.c      Wed Aug 19 09:07:57 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_ixl.c,v 1.72 2020/08/19 09:03:50 yamaguchi Exp $    */
+/*     $NetBSD: if_ixl.c,v 1.73 2020/08/19 09:07:57 yamaguchi Exp $    */
 
 /*
  * Copyright (c) 2013-2015, Intel Corporation
@@ -74,7 +74,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_ixl.c,v 1.72 2020/08/19 09:03:50 yamaguchi Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_ixl.c,v 1.73 2020/08/19 09:07:57 yamaguchi Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_net_mpsafe.h"
@@ -762,8 +762,8 @@
 static bool             ixl_param_nomsix = false;
 static int              ixl_param_stats_interval = IXL_STATS_INTERVAL_MSEC;
 static int              ixl_param_nqps_limit = IXL_QUEUE_NUM;
-static unsigned int     ixl_param_tx_ndescs = 1024;
-static unsigned int     ixl_param_rx_ndescs = 1024;
+static unsigned int     ixl_param_tx_ndescs = 512;
+static unsigned int     ixl_param_rx_ndescs = 256;
 
 static enum i40e_mac_type
            ixl_mactype(pci_product_id_t);