Re: Network very very slow... was iSCSI and jumbo frames

[Chavdar Ivanov <ci4ic4%gmail.com@localhost>]

On Tue, 2 Feb 2021 at 11:19, BERTRAND Joël <joel.bertrand%systella.fr@localhost> wrote:
>
> RVP a écrit :
> > On Tue, 2 Feb 2021, BERTRAND Joël wrote:
> >
> >>> 1. Are ethernet cards on either end gigabit adapters?
> >>
> >>     Yes.
> >>
> >>> 2. Are the cards configured as such by their respective OSes?
> >>>    (use ifconfig -v ifname)
> >>
> >>     Yes.
> >>
> >>> 3. Is the ethernet cable between the two machines Cat-5E or
> >>>    better (with all 8 wires)? (Performance is sometimes not up
> >>>    to spec with some cards and mere Cat-5 cables.)
> >>     Cat6a...
> >>
> >
> > Any errors on the interfaces?
> > Use: netstat -I ifname
> > on NetBSD.
>
>         No, I have verified before my first message :
>
> legendre:[~] > netstat -I wm0
> Name  Mtu   Network       Address              Ipkts Ierrs    Opkts
> Oerrs Colls
> wm0   9000  <Link>        b4:96:91:92:77:6e 21863327     0 90733314
> 0     0
> wm0   9000  192.168.12/24 legendre.systella 21863327     0 90733314
> 0     0
> wm0   9000  fe80::/64     fe80::b696:91ff:f 21863327     0 90733314
> 0     0
> legendre:[~] >

Looking at one of my systems, I see I have identical setups for iSCSI
served by in-kernel iscsi target and for net/istgt, backed by zvols. A
few years ago I started with the built-in one, but had a number of
problems accessing from Windows 10 and Windows Server machines. I
moved the setup to net/istgt and haven't had any problems since.

I don't remember all the reasons I did that, but they included the
clients not attaching after a reboot or hibernation and targets
disappearing after a reboot of the NetBSD server; I've had no such
problems with the package.

I suppose the user-level package probably is less efficient etc., but
it has worked fine for me and perhaps it's worth trying.

Chavdar



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