search for: latenc

...and 8khz, >> and there aren't any obvious artifacts. I also did a 16=>16 test, and the >> results are delayed by 10ms and within +/- 1 (basically, rounding errors >> from the FFT). >> > > Do you plan to use it in VoIP environment? If so, 10ms of additional latency > is a big cost for resampling. Do you think there are any ways to reduce it? > Yes, I plan to use it in a VoIP environment if I can get latency reduced to an acceptable level :) The latency depends directly on the overlap parameter, which also controls the quality. Higher quality =>...

As the subject line says: Is PING a good indicator of network latency? If not, how can I measure latency? Thanks, Cosmin Prund

...el: 2.4.22-32mdk) with a dual 800mhz PIII with 256M Ram 4port FXO digium card, no IRQ sharing I can find (cat /proc/pci & cat /proc/interrupts), vmstat reports a minimum of 80+% CPU idle when problem occurs. connect to a Grandstream 101 (GS) via vpn (no nat). Link has 100ms - 150ms ROUND TRIP latency (constant 'ping' during test). Codec is alaw or ulaw. TDM card is plugged to an NEC PBX (old NEAX 2000 IVS) via the analog station card in the PBX. PROBLEM: Establish a call from the GS to an NEC phone (Dterm III) connected to the PBX. The voice quality on the GS sounds good. The voice...

...calculations using find_by_sql. The problem I¹m encountering is that all computed columns from MySQL come back as type string. E.g., def self.find_averages(domain_id) if @@domain_average return @@domain_average else @@domain_average = MyDomain.find_by_sql(["select avg(latency) as latency, avg(datediff(session_end, session_start)) as session_duration from live_logs where domain_id=?"], domain_id])[0] end end The problem is that I¹m using a lot of to_f conversions because type coercions are not happening as I would have expected. Again, for example: foo = MyDo...

...i, I see that currently physical register uses marked as "undef" can still cause dependencies. Is this intentional? SU(9): %D5<def,undef> = LDrid %R0, 0, %R10<imp-def>, %R11<imp-def> # preds left : 0 # succs left : 11 # rdefs left : 0 Latency : 1 Depth : 0 Height : 0 Successors: ... val SU(14): Latency=1 val SU(14): Latency=1 val SU(14): Latency=1 ... SU(14): %D10<def,undef> = HEXAGON_S2_lsl_r_vh %D5<undef>, %R4, %R10<imp-use>, %R11<imp-use>,...

Hi, What kind of latency is expected using 8,16,32 khz? I am trying to do a realtime stream server, and I am having latency above >500ms ( I capture the sound using the mic, encode it and send it to the client). I am using ALSA system, a SB128 PCI and a 800Mhz P3 . What can I do to lower the latency? I tried a test :...

Attached is a snapshot of work-in-progress of a FFT based resampler. At the moment it works in floating point only, and only basic quality inspection has been done. Some benchmarks comparing the filter-based resampler at Q3 with the FFT resampler with overlap = in_len / 2, using 20ms chunks of data. (-O3 -ffast-math, FFTW3, gcc 4.3.0 on x86_64) 16=>48: 59us vs 19us 16=>44.1: 204us vs

Hi all, I have a question regarding the latency of the true dependency of a store followed by an aliased load in ScheduleDAGInstrs. The latency seems to depend on the store and load being volatile or not as can be seen in the post-RA-sched debug output of the attached ARM example: $ llc -O3 -debug-only=post-RA-sched store_load_latency_test.ll...

Hi Jean-Marc, Thanks for your response. Given a worst case scenario, what is the "worst case" latency (in terms of Speex frames) that the jitter buffer algorithm will incur? We're trying to determine the worst case hard number. Sorry for unclear question below; what I was trying to ask is that given a worst case latency (which I'm asking in the first question) inherent in using the jitte...

I'm planning on setting up some remote agents and before doing so, I did some simple PING tests to measure latency. The average latency I got was 250ms. Does anyone have experience in terms of quality of calls when there is such high latency? Can anyone comment? Thanks, Waldo

...keyboard 2: 0 XT-PIC cascade 8: 3 IO-APIC-edge rtc 14: 2 IO-APIC-edge ide0 15: 505440 IO-APIC-edge ide1 21: 150019 IO-APIC-level eth1 22: 63326503 IO-APIC-level t1xxp -- lspci -bv | grep IRQ Flags: bus master, medium devsel, latency 0, IRQ 11 Flags: bus master, medium devsel, latency 0, IRQ 10 (USB) Flags: bus master, fast devsel, latency 0, IRQ 255 Flags: bus master, medium devsel, latency 0, IRQ 7 Flags: medium devsel, IRQ 5 Flags: bus master, 66Mhz, medium devsel, latency 0, IRQ 3...

...y obvious artifacts. I also did a 16=>16 test, and the > > > results are delayed by 10ms and within +/- 1 (basically, rounding errors > > > from the FFT). > > > > > > > > > > Do you plan to use it in VoIP environment? If so, 10ms of additional > latency > > is a big cost for resampling. Do you think there are any ways to reduce > it? > > > > > Yes, I plan to use it in a VoIP environment if I can get latency reduced to > an acceptable level :) > The latency depends directly on the overlap parameter, which also contr...

Hi i have found a problem related with tbf and the latency that the tbf calculates.. I have used the following parameters for burst and limit burst 100Kbit limit 500Kbit lat81.8ms burst 6Kbit limit 6Kbit lat 0us burst 200Kbit limit 100Kbit lat 4294.9s As u can see in the 3rd column the latency for 100Kbit burst and 500Kbit limit is 81.8ms but for...

Hi, I'm trying to understand why MachineScheduler does a poor job in straight line code in cases like the one in the attached debug dump. This is on AMDGPU, an in-order target, and the problem is that the IMAGE_SAMPLE instructions have very high (80 cycle) latency, but in the resulting schedule they are often placed right next to their uses like this: 1784B %140:vgpr_32 = IMAGE_SAMPLE_LZ_V1_V2 %533:vreg_64, %30:sreg_256, %26:sreg_128, 8, 0, 0, 0, 0, 0, 0, 0, 0, implicit $exec :: (dereferenceable load 4 from custom TargetCustom8) 1792B %142:vgpr_32...

Hi George, Tow months ago, we talked about how to reduce the scheduling latency for a specific VM which runs a mixed workload, where the boost mechanism can not works well. I have tried some methods to reduce the scheduling latency for some assumed latency-sensitive VMs and got some progress on it. Now I hope to make it on demand. That is to say, I hope to get the scheduler t...

We have recently started making more frequent use of the meetme conference of our * system. We are using v1.0.8 with a 2.6.11 kernel on our system. We generally have 4 callers in it: two with the gsm codec and 2 with g729. Initially, the conference works fine and there is little latency. After about 15min., though, the latency is very noticable and by 25min it's unbearable. If we all leave the conference and return, the latency is unnoticable again. The load on the box is minimal, and only our meetme is running most of the time. Checking system load with top shows 0.1 or...

...t; OtherCritCount / SchedModel->getMicroOpFactor() << '\n'); + } for (unsigned PIdx = 1, PEnd = SchedModel->getNumProcResourceKinds(); PIdx != PEnd; ++PIdx) { unsigned OtherCount = getResourceCount(PIdx) + Rem->RemainingCounts[PIdx]; As for "shouldReduceLatency should not be relevant at MicroOpBufferSize = 1": are you suggesting that shouldReduceLatency should effectively be changed to always return true on in-order CPUs? Even with that change, latency comes pretty far down the list of criteria tested in GenericScheduler::tryCandidate. Thanks, Jay....

Hi folks last weekend, I tried Windows Messenger first time and was stunned by the little latency it gives. Until now, I've been using softphones on Linux exclusively, like iaxcomm, linphone and sjphone, and they all give me about 1, at times even 2 secs delay. Whereas Messenger really seems to be in the millisec range. Of course, I'm now curious why there is that difference. Clearly,...

...of Writes: 1576 4173 > 19605 > Block Size: 32768b+ 65536b+ > 131072b+ > No. of Reads: 0 0 > 0 > No. of Writes: 7777 1847 > 657 > %-latency Avg-latency Min-Latency Max-Latency No. of calls > Fop > --------- ----------- ----------- ----------- ------------ > ---- > 0.00 0.00 us 0.00 us 0.00 us 1 > RELEASE > 0.00 18.00 us 18.00 us 18.00 us...

Hi all, I am recently using icecast from server streaming, and even though I succeeding setting everything up to have a radio broadcast, I still have a few questions regarding icecast use. First, latency. I have a setup on a LAN, where I can add audio files to the stream, with a python script that automatically send the location of the file to be played continuously. I wanted to measure the latency from the moment when I sent ices2 a sound file, and the time it is being played. With a clean refres...