Date: Thu, 23 Aug 2018 16:10:28 +0000 (UTC) From: Patrick Kelsey <pkelsey@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r338253 - head/sbin/pfctl Message-ID: <201808231610.w7NGASxr000790@repo.freebsd.org>
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Author: pkelsey Date: Thu Aug 23 16:10:28 2018 New Revision: 338253 URL: https://svnweb.freebsd.org/changeset/base/338253 Log: Extend tbrsize heuristic in pfctl(8) to provide a sensible value for higher bandwidth interfaces. The new value is used above 2.5 Gbps, which is the highest standard rate that could be used prior to r338209, so the default behavior for all existing systems should remain the same. The value of 128 chosen is a balance between being big enough to reduce potential precision/quantization effects stemming from frequent bucket refills over small time intervals and being small enough to prevent a greedy driver from burst dequeuing more packets than it has available hardware ring slots for whenever altq transitions from idle to backlogged. Reviewed by: jmallett, kp MFC after: 2 weeks Sponsored by: RG Nets Differential Revision: https://reviews.freebsd.org/D16852 Modified: head/sbin/pfctl/pfctl_altq.c Modified: head/sbin/pfctl/pfctl_altq.c ============================================================================== --- head/sbin/pfctl/pfctl_altq.c Thu Aug 23 15:01:27 2018 (r338252) +++ head/sbin/pfctl/pfctl_altq.c Thu Aug 23 16:10:28 2018 (r338253) @@ -299,8 +299,10 @@ eval_pfaltq(struct pfctl *pf, struct pf_altq *pa, stru size = 4; else if (rate <= 200 * 1000 * 1000) size = 8; - else + else if (rate <= 2500 * 1000 * 1000) size = 24; + else + size = 128; size = size * getifmtu(pa->ifname); pa->tbrsize = size; }
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