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Allow larger fraction of CPU to be used by netlink

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Instead of doing BATCH_DELAY_MS work and BATCH_DELAY_MS sleep, add
a BATCH_WORK_MS (40) and lower BATCH_DELAY_MS (10), so we'll work
80% of the time, and consume netlink messages 20% of the time.

Also raise the total batch size to 8K because on my test machine
we run 2K in 13ms or 8K in ~50ms.
This commit is contained in:
Pim van Pelt
2021-08-29 17:47:33 +02:00
parent 7c864ed099
commit 6d86d2b075
2 changed files with 9 additions and 6 deletions
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9
lcpng_netlink.c
View File

@ -47,6 +47,7 @@ lcp_nl_main_t lcp_nl_main = {
.rx_buf_size = NL_RX_BUF_SIZE_DEF,
.tx_buf_size = NL_TX_BUF_SIZE_DEF,
.batch_size = NL_BATCH_SIZE_DEF,
.batch_work_ms = NL_BATCH_WORK_MS_DEF,
.batch_delay_ms = NL_BATCH_DELAY_MS_DEF,
};
@ -255,7 +256,7 @@ lcp_nl_process_msgs (void)
lcpm->lcp_sync = 0;
/* process a batch of messages. break if we hit our batch_size
* count limit or batch_delay_ms time limit.
* count limit or batch_work_ms time limit.
*
* We do this, because netlink messages will continue to be sourced
* by the kernel, and we need to periodically read them before they
@ -277,10 +278,10 @@ lcp_nl_process_msgs (void)
break;
}
usecs = (u64) (1e6 * (vlib_time_now (vlib_get_main ()) - start));
if (usecs >= 1e3 * nm->batch_delay_ms)
if (usecs >= 1e3 * nm->batch_work_ms)
{
NL_INFO ("process_msgs: batch_delay_ms %u reached, yielding",
nm->batch_delay_ms);
NL_INFO ("process_msgs: batch_work_ms %u reached, yielding",
nm->batch_work_ms);
break;
}
}

6
lcpng_netlink.h
View File

@ -36,8 +36,9 @@ typedef enum nl_event_type_t_
#define NL_RX_BUF_SIZE_DEF (1 << 27) /* 128 MB */
#define NL_TX_BUF_SIZE_DEF (1 << 18) /* 256 kB */
#define NL_BATCH_SIZE_DEF (1 << 11) /* 2048 */
#define NL_BATCH_DELAY_MS_DEF 50 /* 50 ms, max 20 batch/s */
#define NL_BATCH_SIZE_DEF (1 << 13) /* 8192 */
#define NL_BATCH_WORK_MS_DEF 40 /* 40 ms */
#define NL_BATCH_DELAY_MS_DEF 10 /* 10 ms, max 20 batch/s */
#define NL_DBG(...) vlib_log_debug (lcp_nl_main.nl_logger, __VA_ARGS__);
#define NL_INFO(...) vlib_log_info (lcp_nl_main.nl_logger, __VA_ARGS__);
@ -90,6 +91,7 @@ typedef struct lcp_nl_main
u32 rx_buf_size;
u32 tx_buf_size;
u32 batch_size;
u32 batch_work_ms;
u32 batch_delay_ms;
} lcp_nl_main_t;