r289913:
Use 't' (bits) not 'i' (bytes) for describing MRIE (aka
"Method of Reporting Informational Exceptions") in the SCSI mode database as
the field described in X3T10/94-190 (revision 4; page 2, table 1) [1.] is
4 bits wide, not 4 bytes wide
1. http://ftp.t10.org/ftp/t10/document.94/94-190r4.pdf
Bug 200619
Reported by: Michael Baptist <mbaptist@isilon.com>
Submitted by: Lars Skodje <lskodje@isilon.com>
Sponsored by: EMC / Isilon Storage Division
r289916:
Limit RESOLUTION_MAX to INT_MAX, not UINT_MAX (all spelled out) so the
mode value isn't always clipped to -1 when (resolution * size) == 32, which
would have been the case with values => {4i,32b,32t}.
This seems to have been broken in r64382.
PR: 200619
Reported by: Michael Baptist
Submitted by: Lars Skodje
Sponsored by: EMC / Isilon Storage Division
- Schedule DAD for IN6_IFF_TENTATIVE addresses in nd6_timer(). This
catches cases that DAD probes cannot be sent because of
IFF_UP && !IFF_DRV_RUNNING.
- nd6_dad_starttimer() now calls nd6_dad_ns_output(), instead of
calling it before nd6_dad_starttimer().
- Do not release an entry in dadq when a duplicate entry is being
added.
- Move the remainder of host controller capability registers reading from
xhci_start_controller() to xhci_init(). These values don't change at run-
time so there's no point of acquiring them on every USB_HW_POWER_RESUME
instead of only once during initialization. In r276717, reading the first
couple of registers in question already had been moved as a prerequisite
for the changes in that revision.
- Identify ASMedia ASM1042A controllers.
- Use NULL instead of 0 for pointers.
- Add quirks for USB 3.0 PCI devices.
PR: 203650
The <arch>/mkisoimages.sh script in release knows how to add
extra bits from an "xtra-bits-dir". This feature is unusable
from release/Makefile. Add an XTRADIR setting to use it.
MFC r287697: Whitespace alignment
Differential Revision: https://reviews.freebsd.org/D3633
Reviewed by: kmacy
Relnotes: yes
Replace references to /dev/acd0 with /dev/cd0
atapicd(4) was replaced by cd(4) with the atacam work done by
mav@ and then removed in r249083
X-MFC to: stable/10
newsyslog.conf: allow to configure the signal using the signal name.
Submitted by: Alexandre Perrin <alex@kaworu.ch>
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D3961
Fix overflow bugs in and remove obsolete limit from kernel RPC
implementation.
The kernel RPC code, which is responsible for the low-level scheduling
of incoming NFS requests, contains a throttling mechanism that
prevents too much kernel memory from being tied up by NFS requests
that are being serviced. When the throttle is engaged, the RPC layer
stops servicing incoming NFS sockets, resulting ultimately in
backpressure on the clients (if they're using TCP). However, this is
a very heavy-handed mechanism as it prevents all clients from making
any requests, regardless of how heavy or light they are. (Thus, when
engaged, the throttle often prevents clients from even mounting the
filesystem.) The throttle mechanism applies specifically to requests
that have been received by the RPC layer (from a TCP or UDP socket)
and are queued waiting to be serviced by one of the nfsd threads; it
does not limit the amount of backlog in the socket buffers.
The original implementation limited the total bytes of queued requests
to the minimum of a quarter of (nmbclusters * MCLBYTES) and 45 MiB.
The former limit seems reasonable, since requests queued in the socket
buffers and replies being constructed to the requests in progress will
all require some amount of network memory, but the 45 MiB limit is
plainly ridiculous for modern memory sizes: when running 256 service
threads on a busy server, 45 MiB would result in just a single
maximum-sized NFS3PROC_WRITE queued per thread before throttling.
Removing this limit exposed integer-overflow bugs in the original
computation, and related bugs in the routines that actually account
for the amount of traffic enqueued for service threads. The old
implementation also attempted to reduce accounting overhead by
batching updates until each queue is fully drained, but this is prone
to livelock, resulting in repeated accumulate-throttle-drain cycles on
a busy server. Various data types are changed to long or unsigned
long; explicit 64-bit types are not used due to the unavailability of
64-bit atomics on many 32-bit platforms, but those platforms also
cannot support nmbclusters large enough to cause overflow.
This code (in a 10.1 kernel) is presently running on production NFS
servers at CSAIL.
Summary of this revision:
* Removes 45 MiB limit on requests queued for nfsd service threads
* Fixes integer-overflow and signedness bugs
* Avoids unnecessary throttling by not deferring accounting for
completed requests
Differential Revision: https://reviews.freebsd.org/D2165
Reviewed by: rmacklem, mav
Relnotes: yes
Sponsored by: MIT Computer Science & Artificial Intelligence Laboratory
