Date: Tue, 12 Sep 2017 23:14:35 -0700 From: Ngie Cooper <yaneurabeya@gmail.com> To: Stephen Hurd <shurd@FreeBSD.org> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r323516 - in head/sys: dev/bnxt dev/e1000 kern net sys Message-ID: <4D5AE475-5A38-4429-8B71-DBECDFB0A1FF@gmail.com> In-Reply-To: <201709130118.v8D1IgvB029215@repo.freebsd.org> References: <201709130118.v8D1IgvB029215@repo.freebsd.org>
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> On Sep 12, 2017, at 18:18, Stephen Hurd <shurd@FreeBSD.org> wrote: > > Author: shurd > Date: Wed Sep 13 01:18:42 2017 > New Revision: 323516 > URL: https://svnweb.freebsd.org/changeset/base/323516 > > Log: > Roll up iflib commits from github. This pulls in most of the work done > by Matt Macy as well as other changes which he has accepted via pull > request to his github repo at https://github.com/mattmacy/networking/ > > This should bring -CURRENT and the github repo into close enough sync to > allow small feature branches rather than a large chain of interdependant > patches being developed out of tree. The reset of the synchronization > should be able to be completed on github by splitting the remaining > changes that are not yet ready into short feature branches for later > review as smaller commits. > > Here is a summary of changes included in this patch: > > 1) More checks when INVARIANTS are enabled for eariler problem > detection > 2) Group Task Queue cleanups > - Fix use of duplicate shortdesc for gtaskqueue malloc type. > Some interfaces such as memguard(9) use the short description to > identify malloc types, so duplicates should be avoided. > 3) Allow gtaskqueues to use ithreads in addition to taskqueues > - In some cases, this can improve performance > 4) Better logging when taskqgroup_attach*() fails to set interrupt > affinity. > 5) Do not start gtaskqueues until they're needed > 6) Have mp_ring enqueue function enter the ABDICATED rather than BUSY > state. This moves the TX to the gtaskq and allows processing to > continue faster as well as make TX batching more likely. > 7) Add an ift_txd_errata function to struct if_txrx. This allows > drivers to inspect/modify mbufs before transmission. > 8) Add a new IFLIB_NEED_ZERO_CSUM for drivers to indicate they need > checksums zeroed for checksum offload to work. This avoids modifying > packet data in the TX path when possible. > 9) Use ithreads for iflib I/O instead of taskqueues > 10) Clean up ioctl and support async ioctl functions > 11) Prefetch two cachlines from each mbuf instead of one up to 128B. We > often need to parse packet header info beyond 64B. > 12) Fix potential memory corruption due to fence post error in > bit_nclear() usage. > 13) Improved hang detection and handling > 14) If the packet is smaller than MTU, disable the TSO flags. > This avoids extra packet parsing when not needed. > 15) Move TCP header parsing inside the IS_TSO?() test. > This avoids extra packet parsing when not needed. > 16) Pass chains of mbufs that are not consumed by lro to if_input() > rather call if_input() for each mbuf. > 17) Re-arrange packet header loads to get as much work as possible done > before a cache stall. > 18) Lock the context when calling IFDI_ATTACH_PRE()/IFDI_ATTACH_POST()/ > IFDI_DETACH(); > 19) Attempt to distribute RX/TX tasks across cores more sensibly, > especially when RX and TX share an interrupt. RX will attempt to > take the first threads on a core, and TX will attempt to take > successive threads. > 20) Allow iflib_softirq_alloc_generic() to request affinity to the same > cpus an interrupt has affinity with. This allows TX queues to > ensure they are serviced by the socket the device is on. > 21) Add new iflib sysctls to net.iflib: > - timer_int - interval at which to run per-queue timers in ticks > - force_busdma > 22) Add new per-device iflib sysctls to dev.X.Y.iflib > - rx_budget allows tuning the batch size on the RX path > - watchdog_events Count of watchdog events seen since load > 23) Fix error where netmap_rxq_init() could get called before > IFDI_INIT() > 24) e1000: Fixed version of r323008: post-cold sleep instead of DELAY > when waiting for firmware > - After interrupts are enabled, convert all waits to sleeps > - Eliminates e1000 software/firmware synchronization busy waits after > startup > 25) e1000: Remove special case for budget=1 in em_txrx.c > - Premature optimization which may actually be incorrect with > multi-segment packets > 26) e1000: Split out TX interrupt rather than share an interrupt for > RX and TX. > - Allows better performance by keeping RX and TX paths separate > 27) e1000: Separate igb from em code where suitable > Much easier to understand separate functions and "if (is_igb)" than > previous tests like "if (reg_icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC))" > > #blamebruno > > Reviewed by: sbruno > Approved by: sbruno (mentor) > Sponsored by: Limelight Networks > Differential Revision: https://reviews.freebsd.org/D12235 *gasps at the LoC count and number of changed drivers* Could someone please better break this up in the future..? Thank you, -Ngie
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