Huh, can't say I've tested that. I'll try to look into this. Thanks for the report!
On 0608T2046, [email protected] 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 <[email protected]> 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. > > > > _______________________________________________ > > [email protected] <mailto:[email protected]> mailing > > list > > https://lists.freebsd.org/mailman/listinfo/freebsd-current > > <https://lists.freebsd.org/mailman/listinfo/freebsd-current> > > To unsubscribe, send any mail to "[email protected] > > <mailto:[email protected]>" > _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "[email protected]"
