TiVoHD and S3 users post your MRV transfer speeds

Discussion in 'TiVo Series3 HDTV DVRs' started by BlackBetty, Oct 23, 2007.

  1. Oct 24, 2007 #61 of 149
    murryamorris

    murryamorris Member

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    Feb 1, 2005
    I've only used Jumbo frames on PC to PC transfers of large files. It only works on devices that allow jumbo (Intel NIC's, etc). I didn't know Tivo could handle jumbo frames so don't have it set on my main PC.
     
  2. Oct 24, 2007 #62 of 149
    tivoknucklehead

    tivoknucklehead Well-Known Member

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    Dec 12, 2002
    Orlando Florida
    PC to S3, wireless, draft N Linksys router, G Tivo adapter, distance 70 feet

    210mb mpeg-2 file (10 minutes, 10 seconds long) in 2minutes 52 seconds
     
  3. Oct 24, 2007 #63 of 149
    Narf54321

    Narf54321 New Member

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    Mar 29, 2005
    Tivo doesn't out of the box. Given the general slowness for HiDef transfers, I meant that it may be worth hacking the machine and installing the backport drivers which can support Jumbo frames. Although, I doubt most folks are going to want to mess with hacking the S3/TivoHD unit.

    Perhaps Tivo will finally start looking at improving the network performance. Given the slow Broadcom chips used inside the box, I'm not sure they can do all that much.
    I assume you mean megabytes (MB). So...
    210MB/172sec = 1.22 MegaBytes per second
    (1.22)(MByte/sec)*(8 bits/Byte) = ~ 9.77 Mbps

    70 feet might be a bit much for your 802.11
     
  4. Oct 24, 2007 #64 of 149
    montz

    montz New Member

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    Sep 23, 2007
    Houston, TX
    TiVo wired to Linksys Wireless-G router - wireless connection to my Mac, using TiVoDecode Manager moved an HD, 1-hour "The Office" episode (about 6GB) in about 2 hours. Not too bad!
     
  5. Oct 24, 2007 #65 of 149
    Jiffylush

    Jiffylush New Member

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    Oct 31, 2006
    Only have one TiVo so no MRV but...

    Transferring a 22min xvid (~190mb) to the S3 only used 1-1.6% of my desktop's gig connection. But the transfer was basically realtime, I was able to start watching almost immediately and did not catch up to the buffer.

    BTW, the processor usage on my box was very high (I assume it is transcoding), so it could be that I am processor limited on this. (dual core 3.2, not core 2 duo)
     
  6. Oct 24, 2007 #66 of 149
    String

    String Member

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    Aug 2, 2005
    I have been pretty disappointed. I have a 100mb wired switched network, and a 1 hour SD show ~1.7 GB took about 20 minutes. A 2 hour SD show took about 40 minutes.
     
  7. Oct 24, 2007 #67 of 149
    David Scavo

    David Scavo Member

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    Dec 14, 1999
    Atlanta,...
    Narf,

    Does the TivoHD hardware support Gigabit at all ? Or is jumbo frames with 100mb connection the best it can do (which requires PROM hack and backport drivers) ?

    Thanks.
     
  8. Oct 24, 2007 #68 of 149
    danfi

    danfi New Member

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    Jan 6, 2006
    Kenmore, WA
    While I was at work today I had my PC transferring shows from my Series 3 all day long. It did 12 hours of HD in right around 11 hours. Assuming the transfer speed from the PC to the Series 3 is about the same, at least I could stream a show back and watch it in real time.
     
  9. Oct 24, 2007 #69 of 149
    oldskoolboarder

    oldskoolboarder New Member

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    Jul 8, 2003
    Bay Area, CA

    ~1.7 GB took about 20 minutes? I'd say that was impressive, I'd be happy.

    I moved a 30 min SD show (~170 MB according to Tivo Desktop) from S2 Tivo -> Wired Ethernet -> Netgear Powerline adapter -> AC outlet -> Netgear Powerline adapter -> Wired Ethernet -> S3. It took < 20 min.
     
  10. Oct 24, 2007 #70 of 149
    oldskoolboarder

    oldskoolboarder New Member

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    Jul 8, 2003
    Bay Area, CA
    I know Broadcom is used for the STB functions, I don't think it's the host CPU. In the past, it's been Motorola now Freescale. I also don't know which fast ethernet chip is used. I'm guessing here, but the ineffiency could be due to the Linux driver running on the host CPU and not being optimized along w/ the specific ethernet chip. I don't think any Tivo box has a TCP offload engine in hardware (not needed) so it'd have to be done on the host, burdening it even more. That would make sense considering TivoPony's reference earlier regarding the TivoHD. Guess it's up to the hack community to provide driver "fixes" to possibly increase the TX/RX FIFOs in software or allow jumbo frames if the ethernet chip supports it. But also bear in mind that if jumbo frames are turned on your PC/Mac and Tivo, they ALSO have to be properly done on the switch. And jumbo frames is not truly a defined number. Some consider jumbo to mean 1600 byte frames or 9K byte frames or 10K byte frames etc.

    It is interesting though from the posts here, that S3 to Tivo HD seems to have the best transfer speeds.
     
  11. Oct 24, 2007 #71 of 149
    dammad

    dammad New Member

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    Aug 10, 2007
    In a hardwired test, I get pretty bad numbers from a THD to my PC (Gigabit, dual core).

    I transferred a 30mins clip recorded which was 3672MB (16mbps) in 55mins. That's around 9.97mbps over a 100mbps+ link.

    This was using Tivo Deskop 2.5 and 9.2J on the THD

    Why are some users reporting fast downloads while others see these poor speeds.

    Dammad
     
  12. Oct 24, 2007 #72 of 149
    synch22

    synch22 Member

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    Dec 30, 2003
    i am wireless on my series 2 in the bedroom, I transferred a show from S3 and i could start watching pretty much immediatley. It was 30 mins BBQ University!
     
  13. Oct 25, 2007 #73 of 149
    dammad

    dammad New Member

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    Aug 10, 2007
    I just did the same test as my previous one (2 posts ago) but this time with Tivo Desktop 2.51

    I didn't manage to download the whole program, but TiVo Desktop reported between 1h 15 and 2 hours to download the same file!

    I had a power failure and tried to reconnect and keep getting the problem of getting to 41 out of 161 records and then it stops. I'll just the HTTPS trick to reconnect, but 2.5.1 seems slower *and* far more sensitive in connection.
     
  14. Oct 25, 2007 #74 of 149
    murryamorris

    murryamorris Member

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    Feb 1, 2005
    I was able to time a transfer today and SD program at best quality of 1 hour recording took 20 minutes. This is from an HD to an S3. Network is wired to a gigabit switch, then routed to a wireless router on the S3 side. The THD is hard wired into a Wireless G print server to send the signal to the main router downstairs.

    I haven't tested an HD transfer yet but the SD time looks good to me. That much faster than realtime I can skip easily after just a couple of minutes of transferring. If I were to transfer to a PC, I suppose it would be nice to be as fast as possible but then I'd just transfer from the hard wired unit.
     
  15. Oct 25, 2007 #75 of 149
    dammad

    dammad New Member

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    Aug 10, 2007
    I did another test using the HTTPS interface and got ~750MB/s (around ~6000mbps). That may be okay for SD, but it terrible for HD.
     
  16. Oct 25, 2007 #76 of 149
    moyekj

    moyekj Well-Known Member

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    Mission...
    LOL, surely you mean 750 KBytes/sec, not Mbytes/sec - otherwise that's blazing fast.
     
  17. Oct 25, 2007 #77 of 149
    dammad

    dammad New Member

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    Aug 10, 2007
    For verification, I ran a test that transfered 724MB file from my NAS box (terastation) to the same PC. It transferred in 1.6minutes, or 87.75mbps (no jumbo frames)

    So this thing is *definitely* TiVo bound.

    Based on past posts, THDs seem to be have noticable slowness compared to S3s. :(
     
  18. Oct 25, 2007 #78 of 149
    dammad

    dammad New Member

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    Aug 10, 2007
    Ah, yes.. It's getting late.
     
  19. Oct 25, 2007 #79 of 149
    HDTiVo

    HDTiVo Not so Senior Member

    5,556
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    Nov 27, 2002
    I am transfering a 6GB/hr show at about 9GB/hr from an HD to an S3 using a good 100mb+ wired network incl. a GB switch and a 100mb switch. That's up around 20mbps, which is passable.

    Actually, I wonder if transfer bit rates vary with program bit rate. TiVo may choose to loaf a 2.5mbps program @ 4-5mbps, while stepping it up to 20mbps+ for full bit rate HD recordings.

    I used to see some evidence on the S2s that transfer bit rates increased with program bit rate (recording quality) though I never carefully documented it.

    Something I never noticed, but envisioned as a good idea, was to goose the xfer rate when you are close to the end of the buffer.
     
  20. Oct 25, 2007 #80 of 149
    moyekj

    moyekj Well-Known Member

    11,900
    658
    Jan 23, 2006
    Mission...
    Some other things I wonder if they affect transfer rates (we already know that tuning both tuners to non-subscribed channels gives a big boost in transfer rates):
    * 1080i vs 720p (I know 720p are generally smaller than 1080i but I am talking about comparing the rate of transfer, not how long the total transfer takes)
    * Encrypted vs. non-encrypted? Are recordings from encrypted channels stored on the Tivo the same way as recordings from unencrypted channels? Does Tivo use it's own encryption format for storage on disk? When you MRV from 1 Tivo to another is there any decryption/encryption taking place?
     

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