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pespin gerrit-no-reply at lists.osmocom.orgpespin has submitted this change. ( https://gerrit.osmocom.org/c/osmo-pcu/+/25242 ) Change subject: sched: energy saving: Avoid Tx dummy blocks on empty PDCH TS ...................................................................... sched: energy saving: Avoid Tx dummy blocks on empty PDCH TS Related: SYS#4919 Related: OS#4772 Change-Id: I8d66dd5e838748611e7b77b504fc86295f02c019 --- M src/gprs_rlcmac_sched.cpp 1 file changed, 22 insertions(+), 6 deletions(-) Approvals: osmith: Looks good to me, but someone else must approve laforge: Looks good to me, but someone else must approve pespin: Looks good to me, approved Jenkins Builder: Verified diff --git a/src/gprs_rlcmac_sched.cpp b/src/gprs_rlcmac_sched.cpp index 5427e52..00f740e 100644 --- a/src/gprs_rlcmac_sched.cpp +++ b/src/gprs_rlcmac_sched.cpp @@ -485,12 +485,28 @@ gsmtap_cat = tx_is_egprs ? PCU_GSMTAP_C_DL_DATA_EGPRS : PCU_GSMTAP_C_DL_DATA_GPRS; } - /* Prio 3: send dummy contol message */ - else if ((msg = sched_dummy())) { - /* increase counter */ - gsmtap_cat = PCU_GSMTAP_C_DL_DUMMY; - } else { - return -ENOMEM; + /* Prio 3: send dummy control message if need to poll or USF */ + else { + /* If there's no TBF attached to this PDCH, we can early skip + * since there's nothing to transmit nor to poll/USF. This way + * we help BTS energy saving (on TRX!=C0) by sending nothing + * instead of a dummy block. The early return is done here and + * not at the start of the function because the condition below + * (num_tbfs==0) may not be enough, because temporary dummy TBFs + * created to send Imm Ass Rej (see handle_tbf_reject()) don't + * have a TFI assigned and hence are not attached to the PDCH + * TS, so they don't show up in the count below. + */ + const unsigned num_tbfs = pdch->num_tbfs(GPRS_RLCMAC_DL_TBF) + + pdch->num_tbfs(GPRS_RLCMAC_UL_TBF); + if (trx != 0 && num_tbfs == 0) + return 0; + if ((msg = sched_dummy())) { + /* increase counter */ + gsmtap_cat = PCU_GSMTAP_C_DL_DUMMY; + } else { + return -ENOMEM; + } } if (tx_is_egprs && pdch->has_gprs_only_tbf_attached()) { -- To view, visit https://gerrit.osmocom.org/c/osmo-pcu/+/25242 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-pcu Gerrit-Branch: master Gerrit-Change-Id: I8d66dd5e838748611e7b77b504fc86295f02c019 Gerrit-Change-Number: 25242 Gerrit-PatchSet: 2 Gerrit-Owner: pespin <pespin at sysmocom.de> Gerrit-Reviewer: Jenkins Builder Gerrit-Reviewer: fixeria <vyanitskiy at sysmocom.de> Gerrit-Reviewer: laforge <laforge at osmocom.org> Gerrit-Reviewer: osmith <osmith at sysmocom.de> Gerrit-Reviewer: pespin <pespin at sysmocom.de> Gerrit-MessageType: merged -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/gerrit-log/attachments/20210831/a54a7c8c/attachment.htm>