Hello,
someone can tell me how to enable scheduler statistics and how to display them?
I found this comment:
---------------------------------------
/*
* CSCHED_STATS
*
* Manage very basic per-vCPU counters and stats.
*
* Useful for debugging live systems. The stats are displayed
* with runq dumps (''r'' on the Xen console).
*/
#ifdef PERF_COUNTERS
#define CSCHED_STATS
#endif
---------------------------------------
I''ve just enabled this in Rules.mk:
---------------------------------------
verbose ?= y
perfc ?= y
perfc_arrays ?= y
---------------------------------------
now xenperf works but I don''t know how to access the "Xen
console".
Also, not related to this issue, I''m interested in accounting how many
ticks the net backend driver spends in rx/tx.
Can it make sense using the getrusage() function at start/end of
net_rx_action()/net_tx_action() or it can lead to unconsistent
accounting?
Is there a better way?
Any suggestions are welcome.
Thanks in advance.
Marco
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Hi, 2009/9/12 Marco Tizzoni <marco.tizzoni@gmail.com>:> Hello, > someone can tell me how to enable scheduler statistics and how to display them? > > I found this comment: > > --------------------------------------- > /* > * CSCHED_STATS > * > * Manage very basic per-vCPU counters and stats. > * > * Useful for debugging live systems. The stats are displayed > * with runq dumps (''r'' on the Xen console). > */ > #ifdef PERF_COUNTERS > #define CSCHED_STATS > #endif > --------------------------------------- > > I''ve just enabled this in Rules.mk: > --------------------------------------- > verbose ?= y > perfc ?= y > perfc_arrays ?= y > --------------------------------------- > > now xenperf works but I don''t know how to access the "Xen console". >The perf counters are a debug key. You can access the xen console via serial by doing CTRL+A-CTRL+A, then h. You might need to enable debug for perf counters. You can also invoke a debug key using xm directly. Jean> Also, not related to this issue, I''m interested in accounting how many > ticks the net backend driver spends in rx/tx. > Can it make sense using the getrusage() function at start/end of > net_rx_action()/net_tx_action() or it can lead to unconsistent > accounting? > > Is there a better way? > > Any suggestions are welcome. > > Thanks in advance. > Marco >_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
On Sun, Sep 13, 2009 at 3:27 AM, Jean Guyader <jean.guyader@gmail.com> wrote:> The perf counters are a debug key. You can access the xen console via serial > by doing CTRL+A-CTRL+A, then h. You might need to enable debug > for perf counters.I''m not able to see the xen console attache to an unused tty. I''ve already tried to pass as boot parameter console=tty0,tty9 and console=vga and pressing CTRL+A three times as documented on tty0 but I''m not able to see anything. Any hint? m- _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel