Quote: inter-process communication for user-mode drivers by fixed-length messages and synchronous rendezvous; pending interrupt bitmap; less than 10% penalty

Quotation Skeleton

Minux 3 performs IPC [inter-process communication] by passing fixed-length … copies the message directly from the sender to … Events that cannot be delivered are marked pending … [in] a bitmap … [Interrupt handlers may] set a bit in the driver's "pending … the kernel turns it into a normal message. … Minux 3's IPC design does not require message … [p. 49] The performance loss that user-mode drivers cause … in less than 6 seconds   Google-1   Google-2

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