diff options
| author |   Florin Coras <fcoras@cisco.com> | 2020-07-31 12:32:40 -0700 |
|---|---|---|
| committer |   Florin Coras <florin.coras@gmail.com> | 2020-08-03 15:36:32 +0000 |
| commit | eedc74b804a955de39e013f14c97f2abb4770157 (patch) | |
| tree | 6c9e640858a6f4b548c67ae8d2f97e9d69fdab47 /src/vnet/tcp/tcp_inlines.h | |
| parent | f3ae9e32664ccc3ce0980fcafee9453a3c0cef9b (diff) | |
tcp: improve timestamp rtt accuracy
- switch to using vlib_time as reference for timestamps
- use us precision ticks for tcp but keep using ms precision for
timestamps. As a result, srtt, rttvar and rto are now measured in us
instead of ms. MRTT samples from timestamps are converted from ms to
us (not accurate under ms) while high precision samples are used with us
precision, i.e., they're no longer converted to ms precision samples.
Type: improvement
Change-Id: Ibda559575d9b4fdc85b0985264f7c865ff367e34
Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/tcp/tcp_inlines.h')
| -rw-r--r-- | src/vnet/tcp/tcp_inlines.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/src/vnet/tcp/tcp_inlines.h b/src/vnet/tcp/tcp_inlines.h index c4b155aa499..cb00ca4a97b 100644 --- a/src/vnet/tcp/tcp_inlines.h +++ b/src/vnet/tcp/tcp_inlines.h @@ -218,9 +218,7 @@ tcp_time_now_us (u32 thread_index) always_inline u32 tcp_set_time_now (tcp_worker_ctx_t * wrk) { - tcp_main_t *tm = &tcp_main; - wrk->time_now = (u64) (clib_cpu_time_now () * tm->tstamp_ticks_per_clock); - return wrk->time_now; + return wrk->time_now = (u64) (vlib_time_now (wrk->vm) * TCP_TSTP_HZ); } always_inline tcp_connection_t * |