Huh, can't say I've tested that. I'll try to look into this. Thanks
for the report!
On 0608T2046, peter.b...@bsd4all.org wrote:
> One area that breaks after changing MAXPHYS from 128K to 1MB is the iscsi
> target. I don’t have details, because that server is semi-production and I
> reverted it back ASAP
> > On 5 Jun 2017, at 19:49, Edward Tomasz Napierała <tr...@freebsd.org> wrote:
> > On 0604T0952, Hans Petter Selasky wrote:
> >> On 06/04/17 09:39, Tomoaki AOKI wrote:
> >>> Hi
> >>> One possibility would be to make it MD build-time OTIONS,
> >>> defaulting 1M on regular systems and 128k on smaller systems.
> >>> Of course I guess making it a tunable (or sysctl) would be best,
> >>> though.
> >> Hi,
> >> A tunable sysctl would be fine, but beware that commonly used firmware
> >> out there produced in the millions might hang in a non-recoverable way
> >> if you exceed their "internal limits". Conditionally lowering this
> >> definition is fine, but increasing it needs to be carefully verified.
> >> For example many USB devices are only tested with OS'es like Windows and
> >> MacOS and if these have any kind of limitation on the SCSI transfer
> >> sizes, it is very likely many devices out there do not support any
> >> larger transfer sizes either.
> > FWIW, when testing cfiscsi(4) with Windows and OSX I've noticed
> > that both issue 1MB requests. I wouldn't be surprised if they avoided
> > doing that for older devices, depending on eg the SCSI version reported
> > by device.
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