diff --git a/en/releases/5.2R/todo.sgml b/en/releases/5.2R/todo.sgml index da006e207c..b04051da11 100644 --- a/en/releases/5.2R/todo.sgml +++ b/en/releases/5.2R/todo.sgml @@ -1,368 +1,368 @@ - + %includes; %developers; ]> &header;

Open Issues

This is a list of open issues that need to be resolved for FreeBSD 5.2. If you have any updates for this list, please e-mail re@FreeBSD.org.

Show stopper defects for 5.2-RELEASE

IssueStatusResponsibleDescription
Panic when rebuilding ata-raid arrays -- -- The panic reported in PR kern/58228 must be fixed.
ATAng crashdump causes disk corruption In Progress &a.sos; &a.tegge; Performing a crashdump on an ATA device can result in a corrupted MBR record. Tor has a possible patch for this.
pipe/VM corruption on Alpha -- -- &a.kris; reports that Alpha packages builds are being silently corrupted and suspects pipe and vm issues. This must be investigated and resolved.

Required features for 5.2-RELEASE

IssueStatusResponsibleDescription
KSE support for sparc64 In progress &a.jake; Kernel and userland bits are implemented but untested and known to be incomplete. Required for 5.2-RELEASE.
KSE support for alpha In progress. &a.marcel; Userland bits implemented, kernel bits not implemented. Required for 5.2-RELEASE.
Fine-grained network stack locking without Giant In progress &a.sam; Significant parts of the network stack (especially IPv4 and IPv6) now have fine-grained locking of their data structures. However, it is not yet possible for the netisr threads to run without Giant, due to dependencies on sockets, routing, etc. A 5.2-RELEASE goal is to have the network stack running largely without Giant, which should substantially improve performance of the stack, as well as other system components by reducing contention on Giant.
MAC Framework devfs path fixes In progress &a.rwatson; &a.green; has submitted patches to improve the consistency of the pathnames passed into the MAC Framework devfs labeling entry points. These patches need to be thoroughly reviewed and tested, then merged.
ACL_MASK override of umask support in UFS In progress &a.rwatson; Many systems supporting POSIX.1e ACLs permit a minor violation to that specification, in which the ACL_MASK entry overrides the umask, rather than being intersected with it. The resulting semantics can be useful in group-oriented environments, and as such would be very helpful on FreeBSD.

Desired features for 5.2-RELEASE

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IssueStatusResponsibleDescription
GPT support for sysinstall -- --Sysinstall and libdisk need to be overhauled to support the GDT + Sysinstall and libdisk need to be overhauled to support the GPT partition scheme. This is required for installing ia64 with sysinstall.
PCM locking and performance issues -- -- The PCM audio framework and device drivers have been locked and free of Giant for quite a while, but LOR problems persist along with reports of poor audio performance under load. The locking needs to be reviewed and corrected.
FAST_IPSEC and KAME compatibility -- -- FAST_IPSEC currently cannot be used directly with the KAME IPv6 implementation, requiring an additional level of IP tunnel indirection to protect IPv6 packets when using hardware crypto acceleration. This issue must be resolved so that the two services may more easily be used together. Among other things, this will require a careful review of the handling of mbuf header copying and m_tag support in the KAME IPv6 code.
KAME Synchronization In progress &a.ume; The FreeBSD KAME IPv6 code is now substantially dated with respect to the KAME vendor source. The FreeBSD Project needs to take initiative in driving the merge of new bug fixes, features, et al.
truss support for ptrace In progress &a.robert; Almost all process debugging tools have been updated to use non-procfs kernel primitives, with the exception of truss(1). As procfs is considered deprecated due to its inherent security risks, it is highly desirable to update truss to operate in a post-procfs world. &a.des; had prototype patches; &a.robert; is developing and testing patches now.
Merge of Darwin msdosfs, other fixes -- -- Apple's Darwin operating system has fairly extensive improvements to msdosfs and other kernel services; these fixes must be reviewed and merged to the FreeBSD tree.
Tier-1 Support for AMD64 Hammer In progress &a.peter;, &a.obrien; Productionable support for the AMD64 platform. It currently meets most of the requirements for the Tier-1 classification, but a formal ruling must be made in time for 5.2-RELEASE.
Revised kld build infrastructure -- -- Kernel modules are currently built independently from a kernel configuration, and independently from one another, resulting in substantially redundant compilation of objects, as well as the inability to easily manage compile-time options for kernel objects (such as MAC, PAE, etc) that may require conditional compilation in the kernel modules. In order to improve build performance and better support options of this sort, the KLD build infrastructure needs to be revamped. &a.peter; has done some initial prototyping, and should be contacted before starting on this work.
Light-weight interrupt threads, context switches -- -- Currently, there are two classes of interrupt handlers in 5.x: fast interrupt handlers which run entirely in interrupt context, and heavy-weight handlers which execute in a full-weight kernel interrupt thread. It is possible to optimize interrupt thread context management such that a light-weight context switch is performed to begin execution of the interrupt thread in the handler context, and only when a full-weight context is required (such as sleeping on a lock) is that cost required. This optimization should substantially improve interrupt latency. There are also additional kernel thread context switch optimizations that can be made to improve the performance of thread workers in the kernel, such as found in the network stack, crypto worker threads, and GEOM. &a.bmilekic; has done substantial prototyping work, and should be coordinated with.
Complete the APIC PCI interrupt routing support In progress &a.jhb The existing APIC interrupt code does not support PCI interrupt routing properly. As a result, PCI interrupts cannot be routed either via ACPI or across PCI-PCI bridges.
Run-time autoconfiguration of GBDE and related transforms -- -- Currently, gbde must be manually configured at run-time each time an encrypted disk device is mounted. This prevents easy integration into /etc/fstab and easy automated deployment. Improved integration with the configuration, mounting, and boot process is required to make this feature more easily accessible.
rpc.lockd(8) stability In progress &a.rwatson; A process cannot be interrupted while waiting on a lock. Fixing - this requires that the rpc code be taught how to deal with lock + this requires that the RPC code be taught how to deal with lock cancellation and interruption events.
Race conditions in truss Errata candidate &a.robert; Truss appears to contain a race condition during the start-up of debugging, which can result in truss failing to attach to the process before it exits. The symptom is that truss reports that it cannot open the procfs node supporting the process being debugged. A bug also appears to exist where in truss will hang if execve() returns ENOENT. A further race appears to exist in which truss will return "PIOCWAIT: Input/output error" occasionally on startup. The fix for this sufficiently changes process execution handling that we will defer the fix to post-5.0 and consider this errata.
gdb -k support for alpha -- &a.mp; gdb -k doesn't work on alpha
MAC support for NFS Server -- &a.rwatson; Currently, MAC protections are enforced only on locally originated file system operations (VOPs), and not on RPCs generated via the NFS server. Improvements in NFS server credential handling are required to correct this problem, as well as the introduction of new entry points to properly label NFS credentials and perform enforcement properly.
busdma in all PCI drivers -- -- All PCI drivers must use busdma for DMA; no use of vtophys() will be permitted for any recent device driver. ISA drivers may be exempt.
GDB thread support -- -- With improved support for threading primitives, support is now required to ease debugging of threaded applications. Ideally, this support will work for both libthr and libkse threading models.
Per object ELF Prebinding support In progress &a.mdodd;

Prebinding reduces executable startup time by lowering the expense of symbol lookup, binding and relocation. This is accomplished by a prebinding data file or ELF segment that contains intermediate lookup results allowing fast symbol binding and relocation, provided that dependent objects remain unchanged since the prebinding information was generated.

The benefits of prebinding are realized when running executables that use a large (>10) number of shared libraries. C++ applications also benefit as they contain a large number of relocations.
filedesc LOR -- -- The LOR reported in PR kern/55175 needs to be fixed. Filedesc locking needs to be heavily reviewed in general.

Documentation items that must be resolved for 5.2

IssueStatusResponsibleDescription
Bluetooth documentation -- Pav Lucistnik It'd be nice to have some Bluetooth documentation for the Handbook.

Testing focuses for 5.2-RELEASE

IssueStatusResponsibleDescription
ATA driver structural improvements, MPsafety Complete &a.sos; New ATA model has arrived, supporting fine-grained locking, and more. Much testing is needed to ensure no regressions.
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