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HP Proliant DL580 G4 memory extremely slow

siegerstein
Occasional Visitor

HP Proliant DL580 G4 memory extremely slow

Hi! I found that system is very very slow, and found, that memory speed (read or write) time to time down 10 times.

Command to test:

 

mkdir RAM_test && sudo mount tmpfs -t tmpfs RAM_test && cd RAM_test
dd if=/dev/zero of=data_tmp bs=128k count=1024

 

gives strange results:

 

alex@node6:~/RAM_test$ dd if=/dev/zero of=data_tmp bs=128k count=1024
1024+0 records in
1024+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 4.89601 s, 27.4 MB/s
alex@node6:~/RAM_test$ dd if=/dev/zero of=data_tmp bs=128k count=1024
1024+0 records in
1024+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 5.05714 s, 26.5 MB/s
alex@node6:~/RAM_test$ dd if=/dev/zero of=data_tmp bs=128k count=1024
1024+0 records in
1024+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 4.39217 s, 30.6 MB/s
alex@node6:~/RAM_test$ dd if=/dev/zero of=data_tmp bs=128k count=1024
1024+0 records in
1024+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 0.669536 s, 200 MB/s
alex@node6:~/RAM_test$ dd if=/dev/zero of=data_tmp bs=128k count=1024
1024+0 records in
1024+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 0.717854 s, 187 MB/s
alex@node6:~/RAM_test$ dd if=/dev/zero of=data_tmp bs=128k count=1024
1024+0 records in
1024+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 4.90812 s, 27.3 MB/s
alex@node6:~/RAM_test$

 

So, some times we have like about 200MB/s, and some times about 30Mb/s.

OS: Ubuntu 16.04

I've tried different memories, in different variations, 1 block, 4 blocks, 2 DIMM, 4 DIMM - no result. Memory configured as default Advanced ECC - no hot-add

Memory - original from HP (1Gb DDR2 EEC) - all the same part number. I tried different - the same result. Looks like something with hardware? Reseting NVROM to default also didn't make any effect.

I have couple of DL380 - they show about 910Mb/s. 

Can anybody have some ideas what is wrong with memory?