prakashsurya commented on this pull request.

> @@ -88,6 +89,9 @@
 #include <sys/systeminfo.h>
 #define        MAXISALEN       257     /* based on sysinfo(2) man page */
+static int mount_tq_nthr = 512;        /* taskq threads for multi-threaded 
mounting */

I talked to Seb about this today, and it's like I was assuming.

The number 512 here isn't necessarily special (we could change it), we just 
want a number large enough such that we can create enough threads to saturate 
the storage IOPs. Since each thread performing a mount will generally be IO 
bound, we want to have enough threads mounting concurrently, so that we more 
effectively utilize the storage IOPs.

As far as CPU caps and zone considerations, I _think_ 512 should be fine. The 
performance consideration here is to make sure we issue enough IO, so we still 
want to have multiple threads issues mounts concurrently, even if we can only 
have a single thread running at a time. i.e. we want to be able to issue 
another mount, when the previous thread/mount blocks on IO.

With that said, I'm not familiar with the CPU caps available, so perhaps I'm 
overlooking something. Let me know if you'd like some more information, and/or 
if you still have concerns here.

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