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Re: kern/54837: ixl* + wm* interrupt allocation fails

The following reply was made to PR kern/54837; it has been noted by GNATS.

From: Shoichi Yamaguchi <>
Subject: Re: kern/54837: ixl* + wm* interrupt allocation fails
Date: Fri, 10 Jan 2020 14:48:11 +0900

 >>  To mitigate this problem, x86's softint bitmask should be
 > s/softint bitmask/imask, ipending and some others/
 >>  increased from 32bit to 64bit. Even if it's done, the problem
 >>  won't be solved on many core systems. To resolve the problem,
 >>  IDTVEC should be per-CPU.
 This problem may be avoided by using "IXL_QUEUE_NUM" added at
 The kernel option can restrict resources related to queue pairs
 including an interrupt when the parameter sets to less than
 the number of cpus.
 This is a workaround, not a solution since the restriction causes the
 performance reduction.
 -- yamaguchi

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