Date: Thu, 11 Dec 2025 20:43:35 +0000 From: Kevin Bowling <kbowling@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 714051f3f804 - stable/15 - e1000: Bump 82574/82583 PBA to 32K Message-ID: <693b2cf7.318ed.2ab06dd2@gitrepo.freebsd.org>
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The branch stable/15 has been updated by kbowling: URL: https://cgit.FreeBSD.org/src/commit/?id=714051f3f804f094a6d68ebd2044beadd8ba6b96 commit 714051f3f804f094a6d68ebd2044beadd8ba6b96 Author: Kevin Bowling <kbowling@FreeBSD.org> AuthorDate: 2025-11-21 05:02:00 +0000 Commit: Kevin Bowling <kbowling@FreeBSD.org> CommitDate: 2025-12-11 20:43:12 +0000 e1000: Bump 82574/82583 PBA to 32K The reporter contacted me with packet loss and throughput fluctuations on a low power machine (Intel J1900) that got worse with the recent AIM algorithm in FreeBSD 14.2+. 32K RX PBA matches Linux default. Add a conditional path since we don't otherwise do a fixup for jumbo frames to retain space for two frames in Tx. With this change and an additional errata change, the throughput meets line rate for the reporter. Reported by: Codin <codin@nagi.ftp.sh> Tested by: Codin <codin@nagi.ftp.sh> (cherry picked from commit aa30bab9a92e1be230b9708bff9f33aae7d384e5) --- sys/dev/e1000/if_em.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/sys/dev/e1000/if_em.c b/sys/dev/e1000/if_em.c index 465e019029d9..444b16912fee 100644 --- a/sys/dev/e1000/if_em.c +++ b/sys/dev/e1000/if_em.c @@ -3080,9 +3080,13 @@ em_reset(if_ctx_t ctx) case e1000_82573: pba = E1000_PBA_12K; /* 12K for Rx, 20K for Tx */ break; + /* 82574/82583: Total Packet Buffer is 40K */ case e1000_82574: case e1000_82583: - pba = E1000_PBA_20K; /* 20K for Rx, 20K for Tx */ + if (hw->mac.max_frame_size > 8192) + pba = E1000_PBA_22K; /* 22K for Rx, 18K for Tx */ + else + pba = E1000_PBA_32K; /* 32K for RX, 8K for Tx */ break; case e1000_ich8lan: pba = E1000_PBA_8K;
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