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On 2014-06-22 10:56, O. Hartmann wrote:
>=20
> Hello.
>=20
> I face a strange problem on a set of CURRENT driven boxes. The systems =
in question are
> all the same version of CURRENT (more or less, a week or so discrepancy=
).
>=20
> The boxes affected have 8 GB of RAM and are old-style Core2Duo systems.=
>=20
> The phenomenon:
>=20
> Starting up the box shows the operating system working. But sometimes i=
t is impossible to
> start certain applications, like Firefox - they segfault. More disturbi=
ng is the fail of
> the linker when building world. Sometimes I get strange messages like
>=20
> relocation truncated to fit: R_X86_64_PC32 against symbol `__error' def=
ined in .text
>=20
> when compiling/linking. The funny thing is: rebooting the box and doing=
exactly the same
> very often leaves the system then operable - starting applications work=
s, compiling works!
>=20
> First I thought this could be a indication of a dying system and so I c=
hecked the memory
> for two days non-stop without any indication of anything wrong. The box=
es do not have ECC
> RAM - it's Intel.
>=20
> I see this problem on two C2D based boxes relatively often (one E8400 t=
wo core, another
> Q6600 quadcore, both systems have 8 GB RAM). This phenomenon also occur=
ed two or three
> months ago on another machine with 32 GB RAM and a Core-i7 3930K, but i=
t went away (it was
> the very same error as shown above).
>=20
> Another system, a i3-3220 with 16 GB RAM never showed the problem altho=
ugh that system
> build world also on a regular basis very frequent as the C2D systems do=
=2E
>=20
> Well, I feel a bit confused. On the first view, the problem looks weird=
and it indicates
> a kind of memory problem - but testing the memory didn't show anything =
wrong.=20
>=20
> Today "windowmaker" stopped starting due to a malformed command in one =
of windowmaker's
> library. I did reboot the box and everything was all right. Then, also =
today, I tried
> compiling world and I got a weird error message about a misspelled "Int=
__xxx", I can not
> remember exactly the text, I rebooted and everything was all right agai=
n.
>=20
> Those errors are frequent on 8GB, C2D based systems and at the moment n=
ot present any
> more on more modern systems with more memory as described above. This c=
ould be a
> coincidence, but it is strange anyway.
>=20
> I do not exclude dying hardware, but I'd like to ask whether there is s=
omething strange
> going on with FreeBSD's memory management at the moment and whether tho=
se problems could
> also be triggered by some nasty bug? I never see a crash (which would a=
lso indicated
> faulty hardware), I mostly realise those strange behaviour either after=
a fresh boot or
> after I ran some memory disk i/o intensive jobs, like updating the port=
s tree.
>=20
> By the way, FreeBSD CURRENT suffer from a tremendous performance cut th=
ese days when
> compiling world and updating the ports tree and running portmaster. On =
one box, on which
> ports reside on a UFS partion, it takes more than 8 minutes to pass the=
portmaster -da,
> which is quick when not compiling world. On another system on which /us=
r/ports is
> residing on ZFS (the box has 16GB RAM!), it takes sometimes 30(!) minut=
es to perform a
> "svn update" while compiling world (that is the i3-3220 with 16 GB RAM =
system), it takes
> 6 - 15 minutes when the box is relaxed and updating the ports tree the =
first time (every
> subsequent update is much faster).
>=20
> Well, I know these reports of mine are a bit weird since I have no exac=
t log of the
> problems, but I think if there is an issue not with the hardware, I rep=
ort those in.
>=20
> Regards,
>=20
> oh
>=20
In order to get a better benchmark for 'svn update' on the ports tree
if you 'zfs unmount pool/usr/ports' it will flush all ARC entries for
that dataset, then 'zfs mount pool/usr/ports' and run the test again.
This should give you more reproducible results
--=20
Allan Jude
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