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On 22/02/2024 10:00, Pancho wrote:
> On 22/02/2024 00:17, Andy Burns wrote:
>> Pancho wrote:
>>
>>> I posted some stats back in December ( hdparm -Ttv), on the opi5 the
>>> nvme was only giving 186 MB/s seq read, not that much more than a
>>> USB3 SSD at 137 MB/s.
>>>
>>> I think, like the oPi5, the rPi5 also has the handicap that it only
>>> allocates PCIe 3.0 x 1 to nvme.
>>>
>>> So yes, nvme is faster in benchmarks, but nowhere near the 3000MB/s
>>> you might see on a PC.
>>
>> I think Jeff Geerling saw 900MB/s ?
>
> Remember, I'm testing nvme on an Orange Pi 5 not a Raspberry Pi 5, but,
> I feel quite inadequate. However, it is what I get.
>
> Here are the results from druck's script:
>
> READ: bw=200MiB/s (209MB/s), 200MiB/s-200MiB/s (209MB/s-209MB/s),
> io=6000MiB (6291MB), run=30060-30060msec
> WRITE: bw=199MiB/s (209MB/s), 199MiB/s-199MiB/s (209MB/s-209MB/s),
> io=6000MiB (6291MB), run=30085-30085msec
> READ: bw=36.0MiB/s (37.8MB/s), 36.0MiB/s-36.0MiB/s
> (37.8MB/s-37.8MB/s), io=1081MiB (1133MB), run=30001-30001msec
> READ: bw=48.1MiB/s (50.4MB/s), 48.1MiB/s-48.1MiB/s
> (50.4MB/s-50.4MB/s), io=1443MiB (1513MB), run=30001-30001msec
>
>
> Maybe my result is so bad because I'm only using a KingSpec nvme drive?
> It's supposed to do 3500MB/s, but I've never tested it in anything that
> could handle that.
>
> I'm not going to use a top range drive on a Pi. The Orange Pi isn't
> doing anything else, isn't busy.
I was curious, so I did a bit of digging, it appears my nvme drive is
running as PCIe gen 1. The oPi5 should be gen 3, The nvme drive should
be gen 3.
$ lspci | grep -i nvme
0004:41:00.0 Non-Volatile memory controller: MAXIO Technology (Hangzhou)
Ltd. NVMe SSD Controller MAP1202 (rev 01)
$ sudo lspci -vv -s 0004:41:00.0 | grep LnkSta
LnkSta: Speed 2.5GT/s (downgraded), Width x1 (downgraded)
LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete
EqualizationPhase1-
Which, from my poor understanding, implies a theoretical top speed of
250MB/s for 1 lane. Which is consistent with my real world tests.
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