This does not make sense to me: > >> dd if=/dev/zero of=xx bs=1G count=1 > >> > >> reports 2.6 GB (expected) IMO ~ 1GB is expected, not 2.6:
$ dd if=/dev/zero of=xx bs=1G count=1 1+0 Datensätze ein 1+0 Datensätze aus 1073741824 Bytes (1,1 GB, 1,0 GiB) kopiert, 0,617959 s, 1,7 GB/s Nik Anno domini 2022 Thu, 23 Jun 14:27:59 +0200 Radisson via Dng scripsit: > Its a normal HD i guess 4096 is ok, > but i do not think that this matters. > > > Am 23.06.22 um 13:11 schrieb Rich W: > > Hi, > > > > A blocksize of 1G seems extreme. > > What is the optimal blocksize of the output device? > > > > Cheers, > > -Rich > > > > > > On Thu, Jun 23, 2022, 4:52 AM Radisson via Dng <[email protected]> wrote: > > > >> Hi list, > >> i found a strange ext4 (?) effect. > >> > >> when i write to a disk: > >> dd if=/dev/zero of=xx bs=1G count=1 > >> > >> reports 2.6 GB (expected) > >> doing again speed drops to 200MB. > >> > >> removing xx restores old speed. > >> > >> I ask the net and it seems that the effect is there > >> since kernel 2.6. I found the explainations a bit confusing. > >> > >> does anyone know more ? > >> > >> note: i was analysing a performace issue for mysql and i am > >> not sure if that problems matters outside tests. > >> > >> re > >> rp > >> > >> _______________________________________________ > >> Dng mailing list > >> [email protected] > >> https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng > >> > > > _______________________________________________ > Dng mailing list > [email protected] > https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng > -- Please do not email me anything that you are not comfortable also sharing with the NSA, CIA ... _______________________________________________ Dng mailing list [email protected] https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
