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Change-Id: I36bb47faea55a6fea7af7ee58d87d8f6dd28f93d
Signed-off-by: Dave Barach <dave@barachs.net>
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The main interior graph-node dispatch loop had a longstanding dangling
vector element reference:
for (i = 0; i < _vec_len (nm->pending_frames); i++)
cpu_time_now = dispatch_pending_node (vm, nm->pending_frames + i,
cpu_time_now);
Passing a pointer to a vector element (nm->pending_frames + i) has
considerable comedic potential if there's any chance that the vector
could expand.
dispatch_pending_node() calls dispatch_node(), and indirectly any
interior graph node dispatch function. If that node happens to expand
nm->pending_frames by filling in a new frame, nm->pending_frames can
expand.
After calling the node dispatch function, dispatch_node() does the
following:
nf = vec_elt_at_index (nm->next_frames, p->next_frame_index);
If nm->pending_frames expands during dispatch function execution, p is
a dangling reference to freed memory.
By luck, the TCP stack managed to allocate a fresh frame which
included "old-p," which caused p->next_frame_index to be filled with
the new-frame poison pattern 0xfefefefe.
This has been broken from day 1, summer 2007, first use of the
third-generation vector processing library.
Change-Id: Ideb6363bb060c4e8bf9b901882c318bd83853121
Signed-off-by: Dave Barach <dave@barachs.net>
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and add adaptive mode support to receive queue
- Migrate vhost to use device infra which does the interface/queue to worker
thread assignment.
- Retire vhost thread CLI and corresponding code which assigns interface/queue
to worker thread. set interface placement should be used instead to customize
the interface/queue to worker thread assignment.
- Retire vhost interrupt/polling option when creating vhost-user interface.
Instead, set interface rx-mode should be used.
- Add code in vnet_device_input_unassign_thread to change the node state
to interrupt if the last polling interface has left the worker thread for the
device of the corresponding interface/queue.
- Add adaptive mode support. The node state is set to interrupt initially.
When the scheduler detects a burst of traffic, it switches the input node to
polling. Then we inform the device that we don't need interrupt notification.
When the traffic subsides, the scheduler switches the input node back to
interrupt. Then we immediately tell the driver that we want interrupt
notification again.
- Remove some duplicate code in vlib/main.c
Change-Id: Id19bb1b9e50e6521c6464f470f5825c26924d3a8
Signed-off-by: Steven <sluong@cisco.com>
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Off by default. Enable via cmdline "... vlib { elog-post-mortem-dump }
..."
Change-Id: I2056b9de9b37475f2bfeeb5404da838f1b42645a
Signed-off-by: Dave Barach <dave@barachs.net>
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This patch deprecates stack-based thread identification,
Also removes requirement that thread stacks are adjacent.
Finally, possibly annoying for some folks, it renames
all occurences of cpu_index and cpu_number with thread
index. Using word "cpu" is misleading here as thread can
be migrated ti different CPU, and also it is not related
to linux cpu index.
Change-Id: I68cdaf661e701d2336fc953dcb9978d10a70f7c1
Signed-off-by: Damjan Marion <damarion@cisco.com>
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Change-Id: I24577bd32ae23fbe8515cc8d960eab5448ce3b5c
Signed-off-by: Damjan Marion <damarion@cisco.com>
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Fix a decade-old ridiculous qsort function bug. Managed to subtract
floating-point numbers as if they were integers, leading to
manufactured time-paradoxes. That completely confuses g2, leading to
the summary disappearance of entire tracks' worth of data at high zoom
levels.
Add a manual alignment tweak parameter to elog_merge, users can
dial-out time paradoxes caused by NTP-grade clock synchronization.
The event-logger has a precision of O(100ns), whereas NTP
synchronization is O(1ms).
Change-Id: I69dedabaa314f69f9df74ec9ee66e21e6c87f703
Signed-off-by: Dave Barach <dave@barachs.net>
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Worker main loop is now shared code with main thread
main loop so no need to export functions anymore.
Change-Id: I99ee2eee981c1b88ca31d20eabeb6c21d030a34d
Signed-off-by: Damjan Marion <damarion@cisco.com>
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vhost currently supports only polling mode. This patch is to add
interrupt mode. When the interface is configured for interrupt
mode, our input node does not get called unless there is a packet
in the vring.
If a particular CPU has one interface configured for polling mode
and another in interrupt, the input node is set to polling for
that CPU.
This diffs also includes two crashes in vlib's dispatch_node. One is
included in https://gerrit.fd.io/r/#/c/5516. The other crash is in
the ASSERT. The ASSERT can become true when the caller of
dispatch_node is in a loop. The first call converted the node
to polling. The second call thereafter will hit the ASSERT.
Change-Id: If17b6d48b20d7d8605c6a161459828637173cd32
Signed-off-by: Steven <sluong@cisco.com>
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dispatch_node may be invoked from vlib main or worker threads. The call to
ELOG_DATA in dispatch_node passes the parameter &vm->elog_main. It works fine
when dispatch_node is invoked from the main thread. It does bad thing when it
is invoked from the worker thread.
While we are at it, make two additional enhancements to the same area.
1. Use ELOG_TRACK_DATA instead of ELOG_DATA to enhance g2 viewer presentation.
2. Since ELOG_DATA is in the data path, it could get very chatty. Make the call
to ELOG_TRACK_DATA conditional compile.
Change-Id: I80ca0eea10bc1e5d0d5549f9844dd9a34dbb65a2
Signed-off-by: Steven <sluong@cisco.com>
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Change-Id: I61464fd1610a9754693f31edd72f9fa1b6926511
Signed-off-by: Damjan Marion <damarion@cisco.com>
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Change-Id: Id18d59c9442602633a6310b2001a95bce8b6b232
Signed-off-by: Damjan Marion <damarion@cisco.com>
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Change-Id: I8e2e8f94a884ab2f9909d0c83ba00edd38cdab77
Signed-off-by: Damjan Marion <damarion@cisco.com>
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Change-Id: I7b51f88292e057c6443b12224486f2d0c9f8ae23
Signed-off-by: Damjan Marion <damarion@cisco.com>
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Dave Barach
Steven
Damjan Marion