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Most em(4) devices now enjoy TSO and TSO6, matching NetBSD and Linux defaults. A prior commit automasks TSO on 10/100 Ethernet due to errata and other bugs for IPv6 were fixed recently allowing this. Mike Karels identified a performance anomaly on Intel 82574L devices. These are multiqueue enabled on FreeBSD since the conversion to iflib. I am investigating whether this can be fixed, in the mean time MSI-X with checksum offloads remain default. i219 SPT devices have an errata that downclocks the DMA engine, which results in TSO not being able to acheive line rate. Therefore, it is disabled on: * Intel(R) I219-LM and I219-V SPT * Intel(R) I219-LM and I219-V SPT-H (2) * Intel(R) I219-LM and I219-V LBG (3) * Intel(R) I219-LM and I219-V SPT (4) * Intel(R) I219-LM and I219-V SPT (5) Many lem(4) devices enjoy TSO, exceptions being 82542, 82543, 82547. TSO6 may be possible for some chipsets but I am still working through my testing matrix and that is hidden behind hw.em.unsupported_tso. If you encounter issues, you may disable TSO with for example: ifconfig em0 -tso -tso6. I ask to be informed of any deviations from normal operation requiring this. Thanks to cc@ for access to emulab.net. On a sample I219 system it saves about 16% CPU on IPv4 and 19% on IPv6. iperf3 -Vc reported numbers: total% user% system% IPv4 TSO 21.3 7 14.4 21.4 6 15.4 21.5 6 15.5 IPv4 no TSO 36.8 5.4 31.4 38.5 5.1 33.5 38.2 5.7 32.6 IPv4 no TSO no TXCSUM 45.1 5.8 39.3 46 6.3 39.7 46.2 5.9 40.4 IPv6 TSO6 21.7 5.4 16.3 21.6 5.1 16.5 21.9 5.6 16.3 IPv6 no TSO6 41.2 5.2 36 41 5.1 36 40.8 5.2 35.7 IPv6 no TSO6 no TXCSUM6 49 5.9 43.1 48.8 4.9 43.9 49 5.6 43.4 Tested by: cc (lem(4)), karels (82574L) MFC after: 3 months Relnotes: yes Sponsored by: BBOX.io Differential Revision: https://reviews.freebsd.org/D41170 |
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| .. | ||
| amd64 | ||
| arm | ||
| arm64 | ||
| bsm | ||
| cam | ||
| cddl | ||
| compat | ||
| conf | ||
| contrib | ||
| crypto | ||
| ddb | ||
| dev | ||
| dts | ||
| fs | ||
| gdb | ||
| geom | ||
| gnu | ||
| i386 | ||
| isa | ||
| kern | ||
| kgssapi | ||
| libkern | ||
| modules | ||
| net | ||
| net80211 | ||
| netgraph | ||
| netinet | ||
| netinet6 | ||
| netipsec | ||
| netlink | ||
| netpfil | ||
| netsmb | ||
| nfs | ||
| nfsclient | ||
| nfsserver | ||
| nlm | ||
| ofed | ||
| opencrypto | ||
| powerpc | ||
| riscv | ||
| rpc | ||
| security | ||
| sys | ||
| teken | ||
| tests | ||
| tools | ||
| ufs | ||
| vm | ||
| x86 | ||
| xdr | ||
| xen | ||
| Makefile | ||
| README.md | ||
FreeBSD Kernel Source:
This directory contains the source files and build glue that make up the FreeBSD kernel and its modules, including both original and contributed software.
Kernel configuration files are located in the conf/ subdirectory of each
architecture. GENERIC is the configuration used in release builds. NOTES
contains documentation of all possible entries. LINT is a compile-only
configuration used to maximize build coverage and detect regressions.
Documentation:
Source code documentation is maintained in a set of man pages, under section 9.
These pages are located in share/man/man9, from the
top-level of the src tree. Consult intro(9)
for an overview of existing pages.
Some additional high-level documentation of the kernel is maintained in the Architecture Handbook.
Source Roadmap:
| Directory | Description |
|---|---|
| amd64 | AMD64 (64-bit x86) architecture support |
| arm | 32-bit ARM architecture support |
| arm64 | 64-bit ARM (AArch64) architecture support |
| cam | Common Access Method storage subsystem - cam(4) and ctl(4) |
| cddl | CDDL-licensed optional sources such as DTrace |
| conf | kernel build glue |
| compat | Linux compatibility layer, FreeBSD 32-bit compatibility |
| contrib | 3rd-party imported software such as OpenZFS |
| crypto | crypto drivers |
| ddb | interactive kernel debugger - ddb(4) |
| fs | most filesystems, excluding UFS, NFS, and ZFS |
| dev | device drivers and other arch independent code |
| gdb | kernel remote GDB stub - gdb(4) |
| geom | GEOM framework - geom(4) |
| i386 | i386 (32-bit x86) architecture support |
| kern | main part of the kernel |
| libkern | libc-like and other support functions for kernel use |
| modules | kernel module infrastructure |
| net | core networking code |
| net80211 | wireless networking (IEEE 802.11) - net80211(4) |
| netgraph | graph-based networking subsystem - netgraph(4) |
| netinet | IPv4 protocol implementation - inet(4) |
| netinet6 | IPv6 protocol implementation - inet6(4) |
| netipsec | IPsec protocol implementation - ipsec(4) |
| netpfil | packet filters - ipfw(4), pf(4), and ipfilter(4) |
| opencrypto | OpenCrypto framework - crypto(7) |
| powerpc | PowerPC/POWER (32 and 64-bit) architecture support |
| riscv | 64-bit RISC-V architecture support |
| security | security facilities - audit(4) and mac(4) |
| sys | kernel headers |
| tests | kernel unit tests |
| ufs | Unix File System - ffs(7) |
| vm | virtual memory system |
| x86 | code shared by AMD64 and i386 architectures |