diff options
| -rw-r--r-- | src/plugins/dpdk/device/init.c | 64 |
1 files changed, 63 insertions, 1 deletions
diff --git a/src/plugins/dpdk/device/init.c b/src/plugins/dpdk/device/init.c index 13dc7deb119..db4316b6246 100644 --- a/src/plugins/dpdk/device/init.c +++ b/src/plugins/dpdk/device/init.c @@ -36,6 +36,7 @@ #include <sys/mount.h> #include <string.h> #include <fcntl.h> +#include <dirent.h> #include <dpdk/device/dpdk_priv.h> @@ -157,6 +158,47 @@ dpdk_port_crc_strip_enabled (dpdk_device_t * xd) return !(xd->port_conf.rxmode.offloads & DEV_RX_OFFLOAD_KEEP_CRC); } +/* The funciton check_l3cache helps check if Level 3 cache exists or not on current CPUs + return value 1: exist. + return value 0: not exist. +*/ +static int +check_l3cache () +{ + + struct dirent *dp; + clib_error_t *err; + const char *sys_cache_dir = "/sys/devices/system/cpu/cpu0/cache"; + DIR *dir_cache = opendir (sys_cache_dir); + + if (dir_cache == NULL) + return -1; + + while ((dp = readdir (dir_cache)) != NULL) + { + if (dp->d_type == DT_DIR) + { + u8 *p = NULL; + int level_cache = -1; + + p = format (p, "%s/%s/%s", sys_cache_dir, dp->d_name, "level"); + if ((err = clib_sysfs_read ((char *) p, "%d", &level_cache))) + clib_error_free (err); + + if (level_cache == 3) + { + closedir (dir_cache); + return 1; + } + } + } + + if (dir_cache != NULL) + closedir (dir_cache); + + return 0; +} + static clib_error_t * dpdk_lib_init (dpdk_main_t * dm) { @@ -501,10 +543,30 @@ dpdk_lib_init (dpdk_main_t * dm) if (devconf->num_rx_desc) xd->nb_rx_desc = devconf->num_rx_desc; + else { + + /* If num_rx_desc is not specified by VPP user, the current CPU is working + with 2M page and has no L3 cache, default num_rx_desc is changed to 512 + from original 1024 to help reduce TLB misses. + */ + if ((clib_mem_get_default_hugepage_size () == 2 << 20) + && check_l3cache() == 0) + xd->nb_rx_desc = 512; + } if (devconf->num_tx_desc) xd->nb_tx_desc = devconf->num_tx_desc; - } + else { + + /* If num_tx_desc is not specified by VPP user, the current CPU is working + with 2M page and has no L3 cache, default num_tx_desc is changed to 512 + from original 1024 to help reduce TLB misses. + */ + if ((clib_mem_get_default_hugepage_size () == 2 << 20) + && check_l3cache() == 0) + xd->nb_tx_desc = 512; + } + } if (xd->pmd == VNET_DPDK_PMD_AF_PACKET) { |