Page Comparison

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You may get an error about missing numa.h, which is required for the cyclictest. You may see something like this:

rt-tests # make 

cc -D VERSION_STRING=0.84 -c src/cyclictest/cyclictest.c -D_GNU_SOURCE -Wall -Wno-nonnull -Isrc/include -O2 -DNUMA

In file included from src/cyclictest/cyclictest.c:37:0:

src/cyclictest/rt_numa.h:23:18: fatal error: numa.h: No such file or directory

compilation terminated.

make: *** [cyclictest.o] Error 1

To resolve this, do the following:

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• The AVG Represents the average latency is being measured on the system.

• The MAX Represents the maximum latency detected on the system.

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Asterisk is a real-time application, therefore when we run this test, we need to base our conclusion on the worse case scenario. We want to make sure that even with the highest latency reported, Asterisk/DAHDI will run just fine.

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• ~0  to  3000:  Excellent  Lower Latency than the default latency of our Drivers

• 3000  to  8000:  Good  Low Latency, Require to change the default latency of our Drivers

• 8000  to  15000:  Fair  Mid Latency, Require to change the default latency of our Driver

• 15000  to  25000:  Problematic  High Latency, Need to determine why the system has that latency

• 25000  to  ∞:  Bad  Our Drivers won't be able to work

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When running hdparm: 

Running hdparm with the "-t" flag will perform timings of device reads for benchmark and comparison purposes. For meaningful results, this operation should be repeated 2-3 times on an otherwise inactive system (no other active processes) with at least a couple of megabytes of free memory. This displays the speed of reading through the buffer cache to the disk without any prior caching of data. The measurement is an indication of how fast the drive can sustain sequential data reads under Linux, without any filesystem overhead. (To ensure accurate measurements, the buffer cache is flushed during the processing of -t using the BLKFLSBUF ioctl.)

Transfer Speeds (MB/Sec)

• ~0  to  20:  Bad  Regardless latency, Recommend to the customer that he need to change his configuration

• 21  to  50:  Acceptable  Good for SOHO system, recommend to the customer that he dont want to do recordings

• 50  to  ∞:  Excellent  This device should no cause latency issues