Reasons for a low speed of a RAM disk

Started by target

target

Reasons for a low speed of a RAM disk   11 July 2020, 20:35

Can someone explain the speed reduction in RAM disk operation on dual-processor boards?

We have two machines with SSD and Windows10 PRO 64bit (the disk was switched during the test):

1. i7-3770 (Ivy Bridge) with 32Gb DDR3-1600 dual channel (at the exchange rate in memory according to AIDA64 in 23GB/sec)
- shows a read-write speed over 3GB/sec on RAM disk

2. server mother on the c602 chipset (s2600GZ) and two E5-2650 V2 (Ivy Bridge) with 64Gb ECC DDR3-1600 quad channel (at the exchange rate in memory according to AIDA64 in 74Gb/sec)
- shows the read-write speed of no more than 2.5GB/sec on RAM disk regardless of the memory allocation in the first or second node, or without selecting this check box

Why does the RAM disk show performance degradation at a higher memory speed on server board?
SoftPerfect Support forum - Andrew avatar image

Re: Reasons for a low speed of a RAM disk   11 July 2020, 21:28

We did observe similar behaviour on a new Xeon machine with ECC memory comparing to a regular mid-range laptop. Contrary to the expectations, RAM Disk performed better on the laptop than on the hi-end Xeon system. Not sure about the reason; could be the ECC memory or something else.

Would you be able to try a different product on your two systems (for example Imdisk) and let us know how it performs?
Nunakoy

Re: Reasons for a low speed of a RAM disk   11 May 2021, 11:59

Hi, yesterday I started trial testing SoftPerfect RAM Disk software. But any settings allow me to have only about 500MB/s speed in the disk.

What I do for testing: I have about 20-30 files 10GB in sum and copy them fist to the RAM disk and then I create a copy folder for the first folder. And what I see, the copying speed is only 480-540MB/s. The disk size is 256GB (I have enough RAM for that), file system NTFS (I tried exFAT also), and no success to increase it. The RAM modules type is 32GB 4Rx4 PC3L-12800L-11-12-C0, the server is Dell PowerEdge R820 (4 CPUs), RAM configured to work at 1333MHz.
SoftPerfect Support forum - Ann avatar image
Ann

Re: Reasons for a low speed of a RAM disk   11 May 2021, 12:08

To exclude the chance that this issue is caused by hardware or the operating system, would you be able to try a different RAM Disk product on your system, as suggested above, and let us know how it performs?
Nunakoy

Re: Reasons for a low speed of a RAM disk   11 May 2021, 13:15

Yes, you are right: the Imdisk behavior is the same. Its speed is 460Mb/s, even a bit slower than SoftPerfect RAM Disk.
What do you think, would you be able to find a solution for increasing RAM disk speed for servers?
SoftPerfect Support forum - Ann avatar image
Ann

Re: Reasons for a low speed of a RAM disk   11 May 2021, 13:21

We will run some tests with our Xeon-based machine in a few days to see if there is a way to improve the performance. In the meantime, would you be able to run CrystalDiskMark and PassMark PerformanceTest on your machine to compare?

Below are the test results from a modern laptop where our RAM Disk demonstrated speeds of 80-90% of the maximum rates from PassMark, but we are still interested in seeing a similar screen shot from your machine.

SoftPerfect support forum

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