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4197 Commits

Author SHA1 Message Date
whitequark 18c394976e runtime: disable the Nagle algorithm entirely. 
See also commit feed91d; that commit fixed the test_rpc_timing test,
but caused frequent hangs elsewhere, which were also caused by buggy
Nagle implementation. Just disable this entirely, as with our
explicit buffering it provides no benefit anyway.
 2016-11-13 00:33:24 +00:00
whitequark feed91d8b2 runtime: buffer RPC send packets. 
This brings mean RPC time from ~45ms to ~2ms.

The cause of the slowness without buffering is, primarily, that lwip
is severely pessimized by small writes, whether with Nagle on or off.
(In fact, disabling Nagle makes it function *better* on many small
writes, which begs the question of what's the point of having Nagle
there in the first place.) In practical terms, the slowness appears
only when writing a 4-byte buffer (the synchronization segment);
writing buffers of other sizes does not trigger the problem.

This all is extremely confusing and the fix is partly palliative,
but since it seems to work reliably and we're migrating off lwip
I think it is unwise to spend any more time debugging this.
 2016-11-12 23:06:33 +00:00
whitequark 3ce1826891 runtime: don't print debug messages to the UART. 
It takes ~4ms to print an empty log line because of how slow
the UART is. This makes the log timestamps useless for debugging
performance problems.

After this commit, it takes ~75us to print an empty log line instead,
which pessimizes test_rpc_timing by less than 2ms with tracing
enabled.
 2016-11-12 20:26:32 +00:00
whitequark acc5e53b32 runtime: print microsecond timestamps in debug messages. 2016-11-12 20:26:32 +00:00
whitequark dca3fb5c96 artiq_devtool: abort if build failed. 2016-11-12 20:26:32 +00:00
whitequark 7c2b1155ef conda: bump llvmlite-artiq dep. 2016-11-12 13:58:00 +00:00
whitequark 5eb940deb7 conda: bump llvmlite-artiq dep. 2016-11-12 04:09:34 +00:00
whitequark d3ee858d16 llvm_ir_generator: use !{→unconditionally.}invariant.load metadata. 
This helps LICM, among other things.
 2016-11-12 04:08:58 +00:00
whitequark 8b6418c604 artiq_devtool: more robust port forwarding. 2016-11-11 15:22:07 +00:00
Sebastien Bourdeauducq fbc2420443 setup: remove paramiko dependency (optional and developer-only) 2016-11-11 11:05:37 +08:00
whitequark 3b6cbb1f06 artiq_devtool: implement. 2016-11-10 20:25:15 +00:00
whitequark 0e76cbc414 artiq_compile: actually disable attribute writeback. 
I wrote both halves of this condition but forgot to hook
them together.

Fixes #586.
 2016-11-10 01:04:36 +00:00
whitequark 67e743d74a conda: use pythonparser 1.0. 2016-11-09 15:19:27 +00:00
whitequark 71f1d38860 conda: tighten pythonparser dependency (fixes #600). 2016-11-09 15:10:53 +00:00
whitequark eee8d05398 doc: clarify kernel_invariant doc (fixes #609). 2016-11-09 14:59:57 +00:00
David Nadlinger bfbdba9205 compiler: Emit all-kernel_invariant objects as LLVM constants 
This enables constant propagation optimisations, as verified by
the included test case. This is only a first stop-gap measure, though;
we should support optimisation based on kernel invariants on a more
fine-grained level.
 2016-11-09 14:50:48 +00:00
Sebastien Bourdeauducq 8a48d6d66e drtio: fix typo 2016-11-09 22:15:42 +08:00
Sebastien Bourdeauducq 863934c4fa drtio: more reliable link layer init 2016-11-09 22:03:47 +08:00
Sebastien Bourdeauducq c92ccd3b5b drtio: add pulse rate example 2016-11-09 15:29:15 +08:00
Sebastien Bourdeauducq 60e748eabe drtio: better LED demo 2016-11-09 14:53:45 +08:00
Sebastien Bourdeauducq d547c5d922 drtio: fix example ref_period 2016-11-09 14:44:01 +08:00
whitequark 124b257e05 conda: update for LLVM 3.9. 2016-11-08 23:24:03 +00:00
Sebastien Bourdeauducq 99ad9b5917 add has_dds, use config flags 2016-11-08 23:33:03 +08:00
whitequark ec8fe6f8bd Revert "Revert "Revert "Revert "Update for LLVM 3.9."""" 
This reverts commit 7b81ed1d18.
 2016-11-08 14:22:47 +00:00
whitequark 7b81ed1d18 Revert "Revert "Revert "Update for LLVM 3.9.""" 
This reverts commit 0d7688017b.
 2016-11-08 12:58:20 +00:00
whitequark a8fd697d41 runtime: unbreak 453e8b7. 
Running
  rustc --cfg 'foo="1"'
does not result in a statement of the form
  do_thing()
to be compilex in.
 2016-11-08 12:57:06 +00:00
whitequark e0297039c9 artiq_run: fix bitrot in .ll/.bc runners. 2016-11-08 12:08:20 +00:00
whitequark 0d7688017b Revert "Revert "Update for LLVM 3.9."" 
This reverts commit 5f5975844a.
 2016-11-08 11:59:16 +00:00
whitequark 798a5f70df Revert "runtime: remove some redundant libm functions copied inline." 
This reverts commit fee75bd50f.

LLVM does not have lround as a libcall and this inhibits LICM.
 2016-11-08 11:54:17 +00:00
Sebastien Bourdeauducq 95acc9b9d4 drtio: allow specifying 7series RXSynchronizer initial phase 2016-11-08 16:52:40 +08:00
Sebastien Bourdeauducq bcb5053fb6 drtio: fix master TSC KCSR readout 2016-11-08 16:40:50 +08:00
Sebastien Bourdeauducq 651d538217 Merge branch 'master' into drtio 2016-11-08 16:11:18 +08:00
Sebastien Bourdeauducq 8c86920364 drtio: add examples 2016-11-08 16:11:10 +08:00
David Nadlinger 6e77f65d50 compiler: Clarify recv_rpc value names and documentation [nfc] 
Previously, the phi emitted for the pointer parameter to recv_rpc was –
rather confusingly – called "size", and the pseudo-code in the comment
had bit-rotted.

Signed-off-by: David Nadlinger <code@klickverbot.at>
 2016-11-07 14:38:21 +00:00
Sebastien Bourdeauducq 78f18a12eb runtime: basic DRTIO init code 2016-11-07 19:34:34 +08:00
Sebastien Bourdeauducq 453e8b7eb3 runtime: support configurations without moninj, log or dds 2016-11-06 23:53:10 +08:00
Sebastien Bourdeauducq 266ae292d9 runtime: support configurations without moninj, log or dds 2016-11-06 23:52:27 +08:00
Sebastien Bourdeauducq c4cd269afc Merge branch 'master' into drtio 2016-11-06 00:13:32 +08:00
Robert Jördens d158c69be0 phaser: fix frequency comment 2016-11-05 16:54:23 +01:00
Sebastien Bourdeauducq 47b9868c68 kc705_drtio_master: pretend drtio is rtio 2016-11-05 23:48:29 +08:00
Sebastien Bourdeauducq de065b7578 kc705_drtio_satellite: set output dir 2016-11-05 23:48:15 +08:00
David Nadlinger 7dcc987dd7 compiler: Fix break/continue targets in loop else blocks 
Previously, they would still target the respective labels in the
just-exited loop.

Signed-off-by: David Nadlinger <code@klickverbot.at>
 2016-11-05 02:35:01 +00:00
Sebastien Bourdeauducq de47123737 drtio: connect RST and LOCKED on 7series RXSynchronizer MMCM 2016-11-05 00:24:49 +08:00
Sebastien Bourdeauducq 5019b03f10 drtio: add echo and packet count test 2016-11-04 22:24:35 +08:00
Sebastien Bourdeauducq df7294792c drtio: break some RT features into manager, add echo request CSR 2016-11-04 19:38:24 +08:00
Sebastien Bourdeauducq 1145a193dd drtio: fix ack of echo and set_time requests 2016-11-04 18:36:43 +08:00
Sebastien Bourdeauducq 3da1cce783 drtio: add packet counters 2016-11-04 17:53:42 +08:00
whitequark f102f2d4e6 manual: fix rustc invocation. 2016-11-04 09:11:45 +00:00
Sebastien Bourdeauducq 8ec73cb9ec dashboard: pack moninj widgets (#603) 2016-11-04 16:20:46 +08:00
Sebastien Bourdeauducq 747da3da15 drtio: differentiate local and remote unknown packet type errors 2016-11-04 15:17:19 +08:00