Lars,
Thanks again for the reply. I had not looked at your link in detail previously because none of the random read/write results were above 15MB/sec, the issue is most obvious when Windows is getting 58 MB/sec and Linux on the same ESXi 5.1 host is getting 11MB/sec or less.
However, this time I did look at thoseresults in more detail. Unfortunately there is only one test with Linux (Debian) shown below. And unfortunately it is not on VMWare but rather XenServer. However, it does actually show the problem I'm describing, just as a smaller scale.
Debian gets 2.6 MB/sec and Windows gets 6.3 MB/sec with apples to apples.
So, I would conclude that my environment is NOT the only one with the issue.
Again - ideally, someone else on this thread will run a Windows and Linux IO Meter test in their own environment and post the results!!
Either this is an issue with the IO Meter test, or there is a real Linux IO performance issue at higher speeds, right?
ERVER TYPE: Virtual Windows 2003R2sp2 on XenServer release 4.0.1-4249p (xenenterprise)
CPU TYPE / NUMBER: VCPU / 1
HOST TYPE: HP DL360G5, 4 GB RAM; 2x XEON E5345, 2,33 GHz, QC
STORAGE TYPE / DISK NUMBER / RAID LEVEL: P400i 256MB 50% read cache / 2xSAS 15k rpm / raid 1 / 128KB stripe size
TEST NAME | Av. Resp. Time ms | Av. IOs/sec | Av. MB/sec |
Max Throughput-100%Read. | 5 | 10445 | 326 |
RealLife-60%Rand-65%Read | 44 | 810 | 6.3 |
Max Throughput-50%Read | 6.46 | 8896 | 278 |
Random-8k-70%Read. | 55.9 | 811 | 6.3 |
EXCEPTIONS: CPU Util. 92% 52% 83% 37%
SERVER TYPE: Virtual Debian Linux 4.0, kernel 2.6.18.xs4.0.1.900.5799 on XenServer release 4.0.1-4249p (xenenterprise)
CPU TYPE / NUMBER: VCPU / 1
HOST TYPE: HP DL360G5, 4 GB RAM; 2x XEON E5345, 2,33 GHz, QC
STORAGE TYPE / DISK NUMBER / RAID LEVEL: P400i 256MB 50% read cache / 2xSAS 15k rpm / raid 1 / 128KB stripe size
TEST NAME | Av. Resp. Time ms | Av. IOs/sec | Av. MB/sec |
Max Throughput-100%Read. | 0.36 | 2773 | 86.6 |
RealLife-60%Rand-65%Read | 3.04 | 328 | 2.6 |
Max Throughput-50%Read | 1.38 | 724 | 22.6 |
Random-8k-70%Read. | 3.3 | 302 | 2.36 |
EXCEPTIONS: CPU Util. 0% 0% 0% 0%