adapter resource shortage

Hello,

While checking out src via cvs syslog (or dmegs) is telling me:

[ 5233.5024630] sd1(isp0:0:2:0): adapter resource shortage
[ 5424.0177487] sd1(isp0:0:2:0): adapter resource shortage
[ 5425.0870873] sd1(isp0:0:2:0): adapter resource shortage
[ 5454.2393759] sd1(isp0:0:2:0): adapter resource shortage
[ 5463.6563541] sd1(isp0:0:2:0): adapter resource shortage
[ 5493.5430218] sd1(isp0:0:2:0): adapter resource shortage
[ 5504.0654627] sd1(isp0:0:2:0): adapter resource shortage

What does that mean? All I have found on this issue is a rather lonely 
post from 2007.
Something to worry about? Or maybe there is even something to do about 
it? Since even old uwscsi with small files should outperform my 10BaseT 
tlp adapter, I am a bit curious.
Even though this does so far not seem to have any real world impact.

Still NetBSD 9.1 GENERIC on a DEC Alphastation 500 - on my path to upgrade.

/dev/sd1a on /data type ffs (log, noatime, local)

Any more information I  should provide?

Thanks

Ede