Weird behavior writing to SSD on 2013 MacBook
Lundberg, Johannes
johannes at brilliantservice.co.jp
Thu Feb 5 00:37:42 UTC 2015
Hi
I'm thought I was gonna do some test runs with HEAD on a 2013 Macbook Air
and noticed some weird behavior regarding disk I/O.
This happens both when doing portsnap extract and clone from git repository.
For example portsnap extract, the extraction process (the output of it)
suddenly stops, for seconds or maybe even minutes, quite many times during
the whole extraction process.
iostat reports ~200 MB/s on ada0 the whole time during freeze.
pciconf:
ahci0 at pci0:4:0:0: class=0x010601 card=0x91831b4b chip=0x91831b4b
rev=0x14 hdr=0x00
vendor = 'Marvell Technology Group Ltd.'
class = mass storage
subclass = SATA
dmesg (relevant lines?):
ahci0: <Marvell 88SS9183 AHCI SATA controller> port
0x1028-0x102f,0x1034-0x1037,0x1020-0x1027,0x1030-0x1033,0x1000-0x101f mem
0xb0700000-0xb07001ff at device 0.0 on pci4
ahci0: AHCI v1.00 with 1 6Gbps ports, Port Multiplier not supported
ahcich0: <AHCI channel> at channel 0 on ahci0
ada0 at ahcich0 bus 0 scbus0 target 0 lun 0
ada0: <APPLE SSD SD0128F A222821> ATA-8 SATA 3.x device
ada0: Serial Number 1325A5401681 \^T\^T\^T\^T\^T\^T\^T
ada0: 600.000MB/s transfers (SATA 3.x, UDMA6, PIO 512bytes)
ada0: Command Queueing enabled
ada0: 115712MB (236978176 512 byte sectors: 16H 63S/T 16383C)
ada0: Previously was known as ad4
GEOM: ada0: enabling Boot Camp
GEOM: diskid/DISK-1325A5401681%20%14%14%14%14%14%14%14: enabling Boot Camp
gpart:
=> 34 236978109 ada0 GPT (113G)
34 6 - free - (3.0K)
40 409600 1 efi (200M)
409640 174519128 2 apple-hfs (83G)
174928768 1269536 3 apple-boot (620M)
176198304 1376 - free - (688K)
176199680 29782016 4 linux-data (14G)
205981696 2097152 5 linux-swap (1.0G)
208078848 1600 6 efi (800K)
208080448 27261368 7 freebsd-ufs (13G)
235341816 1445888 8 freebsd-swap (706M)
236787704 190439 - free - (93M)
One other weird thing is that FreeBSD does not show up in the refind boot
menu by default, only OSX and Linux. I have to press ESC once to reload for
FreeBSD boot option to show up.. Any clues? Is my partition configuration
wrong in some way?
Thanks!
--
Johannes Lundberg
BRILLIANTSERVICE CO., LTD.
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