[mythtv-users] hard drive read benchmarks
Henry A Harper III
hah at alumni.rice.edu
Tue Dec 19 05:01:14 UTC 2006
> Could you guys post some read benchmarks for your drives while
> mythfrontend is and is not running, and also if your drive is SATA or
> not? Here are mine, on a Western Digital 500GB SATA:
>
> this is the command:
> sudo hdparm -Tt /path/to/device
>
>
>
> without mythfrontend:
> jesse at dionysis:~> sudo hdparm -Tt /dev/sda
> /dev/sda:
> Timing cached reads: 2500 MB in 2.00 seconds = 1250.10 MB/sec
> Timing buffered disk reads: 210 MB in 3.02 seconds = 69.63 MB/sec
>
> with mythfrontend:
> /dev/sda:
> Timing cached reads: 328 MB in 2.04 seconds = 161.00 MB/sec
> Timing buffered disk reads: 48 MB in 3.14 seconds = 15.28 MB/sec
>
>
> The reason I am asking is because I am trying to add a second frontend
> to a machine that is front and backend combined. Whenever the second
> machine is connected, one of them will get choppy video and messages
> about ringbuffer taking too long to read, regardless of trying to watch
> HD or SD content.
Mythfrontend showing NBC SNF HD @1.5x speed, no recordings active:
/dev/sda:
Timing cached reads: 2604 MB in 2.00 seconds = 1302.30 MB/sec
Timing buffered disk reads: 214 MB in 3.01 seconds = 71.15 MB/sec
Mythfrontend idle in root menu (Iulius theme):
/dev/sda:
Timing cached reads: 3480 MB in 2.00 seconds = 1740.60 MB/sec
Timing buffered disk reads: 230 MB in 3.02 seconds = 76.11 MB/sec
Box is mythtv 0.20 (svn 11166) FE+BE, FC5 smp, Athlon 4600+ x2 (65W), 1GB
RAM, 2x SATA2 Seagate 750GB (SW RAID1, LVM), 3x hd5500 set up for OTA ATSC
only, 7600gs w/8774. Mobo is a Gigabyte GA-M55plus-S3G.
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