DWC OTG TX path optimisation for 11-current

[Svatopluk Kraus]

On Sat, Aug 15, 2015 at 2:33 PM, Hans Petter Selasky <hps at selasky.org> wrote:
> On 08/09/15 05:09, Andreas Schwarz wrote:
>>
>> On 31.07.15, Hans Petter Selasky wrote:
>>
>>> The attached patch will add some more debug prints so that I know what
>>> is going on in the problematic function. You'll need to C&P me the
>>> resulting console prints.
>>
>>
>> I've applied the patch to r286117 and started to build the world in a
>> loop until the problem occur. See the output below. After the problem
>> was there (last lines), no further debug output was generated by your
>> patch.
>>
>
> Hi,
>
> Can you re-test the latest 11-current after:
>
> https://svnweb.freebsd.org/changeset/base/286802
>


I have re-tested it. I noticed that system behaved a bit differently.
Almost from the beginning of buildworld, disk was very busy and
interrupt rate was not so stable - it was like when the trigger is
pulled. However, it did not fix the problem.

After buildword was finished, I have swap off, network down, system
99% idle, only the following processes exist

root at rpi2:~ # ps -ax
  PID TT  STAT       TIME COMMAND
    0  -  DLs     0:00.87 [kernel]
    1  -  ILs     0:06.51 /sbin/init --
    2  -  RL      0:41.99 [rand_harvestq]
    3  -  DL      0:00.00 [crypto]
    4  -  DL      0:00.00 [crypto returns]
    5  -  DL      0:28.66 [cam]
    6  -  IL      0:00.00 [VCHIQ-0]
    7  -  IL      0:00.00 [VCHIQr-0]
    8  -  IL      0:00.00 [VCHIQs-0]
    9  -  DL      0:00.00 [sctp_iterator]
   10  -  RL   4774:38.93 [idle]
   11  -  WL     27:37.49 [intr]
   12  -  DL      0:35.24 [geom]
   13  -  DL     29:50.89 [usb]
   14  -  DL      0:00.01 [mmcsd0: mmc/sd card]
   15  -  IL      0:00.00 [VCHIQka-0]
   16  -  IL      0:00.00 [bcm2835_audio_worke]
   17  -  DL      0:46.60 [pagedaemon]
   18  -  DL      0:03.80 [vmdaemon]
   19  -  DL      0:00.00 [pagezero]
   20  -  DL      0:07.70 [bufdaemon]
   21  -  DL      2:17.08 [syncer]
   22  -  RL      0:02.01 [vnlru]
  369  -  Is      0:00.26 /sbin/devd
  683 u0  IWs     0:00.00 login [pam] (login)
  684 u0  R       0:00.40 -csh (csh)
22887 u0  R+      0:00.01 ps -ax
22873 v0  Is+     0:00.01 /usr/libexec/getty Pc ttyv0

interrupt's rate is following

root at rpi2:~ # vmstat -i -w1
interrupt                          total       rate
irq1: mbox0                           27          0
irq2: vchiq0                           7          0
irq17: bcm283x_dwco            567896005         10
irq26: bcm_dma0                      962          0
irq65: uart0                     7942705         40
irq70: sdhci_bcm0                    496          0
irq73: generic_time             19187335         22
irq76: ipi                        845121          9
Total                          595872658       6487
irq1: mbox0                            0          0
irq2: vchiq0                           0          0
irq17: bcm283x_dwco                  641        606
irq26: bcm_dma0                        0          0
irq65: uart0                         525        496
irq70: sdhci_bcm0                      0          0
irq73: generic_time                   18         17
irq76: ipi                             2          2
Total                               1186       1121
irq1: mbox0                            0          0
irq2: vchiq0                           0          0
irq17: bcm283x_dwco                  277        262
irq26: bcm_dma0                        0          0
irq65: uart0                         476        450
irq70: sdhci_bcm0                      0          0
irq73: generic_time                   13         12
irq76: ipi                             3          3
Total                                769        727
irq1: mbox0                            0          0
irq2: vchiq0                           0          0
irq17: bcm283x_dwco                  653        641
irq26: bcm_dma0                        0          0
irq65: uart0                         475        466
irq70: sdhci_bcm0                      0          0
irq73: generic_time                   11         11
irq76: ipi                             1          1
Total                               1140       1119
irq1: mbox0                            0          0
irq2: vchiq0                           0          0
irq17: bcm283x_dwco                  434        405
irq26: bcm_dma0                        0          0
irq65: uart0                         474        442
irq70: sdhci_bcm0                      0          0
irq73: generic_time                   12         11
irq76: ipi                             3          3
Total                                923        861


and still the system response time is terrible.

Do I understand it well that you are not able to trigger the problem?
Unfortunatelly, I cannot get any reasonable results from my
investigation except some mirror fixes which did not fix the problem.
Thus I need to work out how to investigate it better and it takes some
time.

Svata



> --HPS
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