Re: Weird behavior writing to SSD on 2013 MacBook

I deleted /usr/ports and did a new portsnap extract

portsnap stopped at /usr/ports/editors/teco

that folder is empty and the previous folder (editors/tea) is populated
with files.

portsnap stopped for about 2-3 minutes and during the whole time gstat
showed values like this: (disc io load was constantly fluctuating around
200 MB/s, not static)

dT: 1.002s  w: 1.000s
 L(q)  ops/s    r/s   kBps   ms/r    w/s   kBps   ms/w   %busy Name
 1240  43523      0      0    0.0  43523 220158   24.1   99.5| ada0
    0      0      0      0    0.0      0      0    0.0    0.0| ada0p1
    0      0      0      0    0.0      0      0    0.0    0.0| ada0p2
    0      0      0      0    0.0      0      0    0.0    0.0| ada0p3
    0      0      0      0    0.0      0      0    0.0    0.0| ada0p4
    0      0      0      0    0.0      0      0    0.0    0.0| ada0p5
    0      0      0      0    0.0      0      0    0.0    0.0| ada0p6
 1240  43523      0      0    0.0  43523 220158   24.1   99.5| ada0p7
    0      0      0      0    0.0      0      0    0.0    0.0| ada0p8
    0      0      0      0    0.0      0      0    0.0    0.0|
gpt/EFI%20System%20Partition
    0      0      0      0    0.0      0      0    0.0    0.0|
gptid/ca33c17c-0ef4-4d9b-b2bb-cb37a907504b
    0      0      0      0    0.0      0      0    0.0    0.0| msdosfs/EFI
    0      0      0      0    0.0      0      0    0.0    0.0| gpt/Untitled
    0      0      0      0    0.0      0      0    0.0    0.0|
gptid/319461e8-0310-47d5-b4d1-6ba5a92cf9a9
    0      0      0      0    0.0      0      0    0.0    0.0|
gpt/Recovery%20HD
    0      0      0      0    0.0      0      0    0.0    0.0|
gptid/cb9530b7-8872-46d0-b36c-fca667b4e541
    0      0      0      0    0.0      0      0    0.0    0.0|
gptid/6ac11466-21c5-4420-85bc-eb1c3c7fa616
    0      0      0      0    0.0      0      0    0.0    0.0|
gptid/0047cc59-6b75-4508-98d0-842beafd3164
    0      0      0      0    0.0      0      0    0.0    0.0|
gptid/ddebb168-ac18-11e4-8f9e-283737012e32
    0      0      0      0    0.0      0      0    0.0    0.0|
msdosfs/NO_NAME


That is, 100% busy and 200 MB/s...

top shows

last pid: 13709;  load averages:  1.18,  0.98,
0.58
up 0+00:28:36  10:35:38
27 processes:  1 running, 26 sleeping
CPU:  0.0% user,  0.0% nice, 12.3% system, 11.1% interrupt, 76.6% idle
Mem: 25M Active, 651M Inact, 587M Wired, 30M Cache, 411M Buf, 2566M Free
Swap: 706M Total, 706M Free


I have used FreeBSD with SSD plenty and never seen this behavior before.

--
Johannes Lundberg
BRILLIANTSERVICE CO., LTD.

On Thu, Feb 5, 2015 at 10:14 AM, Allan Jude <allanjude_at_freebsd.org> wrote:

> On 2015-02-04 19:29, Lundberg, Johannes wrote:
> > 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.
> >
>
> For the disk io bit, try running 'gstat' instead of iostat, and see what
> it says.
>
> --
> Allan Jude
>
>

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