SSD speed in Pogoplug Pro (1 reply)

Hi all,

I have 2 pogoplug pro's running Debian bookworm, latest kernel:

Linux pogo01 5.15.158-oxnas-tld-2 #2 SMP PREEMPT Sun May 12 18:45:05 PDT 2024 armv6l GNU/Linux

In both plugs I have installed an SSD -> https://blog.westelinck.net/2023/01/adding-sata-ssd-to-pogoplug-pro.html

One of the plugs is now running pi-hole v6 and the v6 version is using a lot more memory than the v5 version ... and I see performance problems.

I am not an export, but I think it boils down to disk I/O ... when writing a 512MB file, these are the results:

dd if=/dev/zero of=/root/tempfile bs=1M count=512 conv=fdatasync
512+0 records in
512+0 records out
536870912 bytes (537 MB, 512 MiB) copied, 41.7972 s, 12.8 MB/s

So not that fast. I can also observe this in dmesg:

    7.887441] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[    7.893839] ehci-pci: EHCI PCI platform driver
[    7.901258] ata1.00: ATA-9: SanDisk SSD U100 16GB, 10.52.01, max UDMA/133
[    7.913331] ata1.00: 31277232 sectors, multi 1: LBA48 NCQ (depth 0/32)
[    7.921221] ata1.00: configured for UDMA/133
[    7.926192] sata_oxnas: resetting SATA core
[    8.107491] oxnas-ehci 40200100.ehci: EHCI Host Controller
[    8.113710] oxnas-ehci 40200100.ehci: new USB bus registered, assigned bus number 1
[    8.122419] oxnas-ehci 40200100.ehci: irq 60, io mem 0x40200100
[    8.157475] oxnas-ehci 40200100.ehci: USB 2.0 started, EHCI 1.00
[    8.164590] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.15
[    8.173591] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    8.181519] usb usb1: Product: EHCI Host Controller
[    8.187074] usb usb1: Manufacturer: Linux 5.15.158-oxnas-tld-2 ehci_hcd
[    8.194383] usb usb1: SerialNumber: 40200100.ehci
[    8.200885] hub 1-0:1.0: USB hub found
[    8.205404] hub 1-0:1.0: 2 ports detected
[    8.211566] usbcore: registered new interface driver cdc_wdm
[    8.218152] usbcore: registered new interface driver usb-storage
[    8.225041] usbcore: registered new interface driver usbserial_generic
[    8.232337] usbserial: USB Serial support registered for generic
[    8.239787] mousedev: PS/2 mouse device common for all mice
[    8.246259] i2c_dev: i2c /dev entries driver
[    8.253790] ledtrig-cpu: registered to indicate activity on CPUs
[    8.260723] hid: raw HID events driver (C) Jiri Kosina
[    8.266759] usbcore: registered new interface driver usbhid
[    8.273054] usbhid: USB HID core driver
[    8.279464] NET: Registered PF_INET6 protocol family
[    8.287823] Segment Routing with IPv6
[    8.292180] RPL Segment Routing with IPv6
[    8.296952] In-situ OAM (IOAM) with IPv6
[    8.301790] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
[    8.310827] NET: Registered PF_PACKET protocol family
[    8.317171] Key type dns_resolver registered
[    8.323548] registered taskstats version 1
[    8.328465] Loading compiled-in X.509 certificates
[    8.334809] zswap: loaded using pool lzo/zbud
[    8.341447] Key type .fscrypt registered
[    8.346063] Key type fscrypt-provisioning registered
[    8.355182] Key type big_key registered
[    8.415912] Key type encrypted registered
[    8.507425] usb 1-1: new high-speed USB device number 2 using oxnas-ehci
[    8.667445] oxnas-pcie 47c00000.pcie: PCIe version/deviceID 0x82510b5
[    8.729259] usb 1-1: New USB device found, idVendor=05e3, idProduct=0608, bcdDevice=77.64
[    8.747397] usb 1-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[    8.755210] usb 1-1: Product: USB2.0 Hub
[    8.769016] hub 1-1:1.0: USB hub found
[    8.773916] hub 1-1:1.0: 4 ports detected
[    9.617408] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[    9.628026] ata1.00: configured for UDMA/133
[    9.633011] sata_oxnas: resetting SATA core
[    9.677383] oxnas-pcie 47c00000.pcie: link down
[    9.683000] oxnas-pcie 47c00000.pcie: PCI host bridge to bus 0000:00
[    9.690086] pci_bus 0000:00: root bus resource [mem 0x48000000-0x49ffffff]
[    9.697697] pci_bus 0000:00: root bus resource [mem 0x4a000000-0x4bdfffff pref]
[    9.705681] pci_bus 0000:00: root bus resource [io  0x0000-0xfffff]
[    9.712660] pci_bus 0000:00: root bus resource [bus 00-7f]
[    9.719680] PCI: bus0: Fast back to back transfers enabled
[    9.726709] clk: Disabling unused clocks
[   10.417448] ata1.00: limiting speed to UDMA/100:PIO4
[   11.357432] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[   11.364981] ata1.00: configured for UDMA/100
[   11.370004] sata_oxnas: resetting SATA core
[   12.147445] ata1.00: limiting speed to UDMA/33:PIO4
[   13.087439] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[   13.094917] ata1.00: configured for UDMA/33
[   13.099855] sata_oxnas: resetting SATA core
[   14.817436] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[   14.824929] ata1.00: configured for UDMA/33
[   14.829864] ata1: EH pending after 5 tries, giving up

What does this mean? And why is it falling back to UDMA/33.