search for: softirqs

Hi, Keir, Thanks for checking in cpu online/offline support. Another thought inspired by Kevin, due to the time sequence that different cpus enter the stop machine context, there is a small window that some kind of softirqs (say softirq_A) are issued to the dying cpu right after the dying cpu has already handled softirq_A in do_softirq before entering stop_machine softirq. So this softirq_A should be handled by the dying cpu after exiting from stop_machine context. However, scheduling to idle leaves no change for soft...

In "Understanding the Linux Kernel" 3rd edition, section 4.7 "Softirqs and Tasklets" it states: "Activation and execution [of defferable functions] are bound together: a deferrable function that has been activated by a given CPU must be executed on the same CPU. There is no self-evident reason suggesting that this rule is beneficial for system performance....

Hi, I have a machine under heavy network traffic. Kernel is Centos kernel 2.6.18 SMP 32 bit. Ethernets are 05:00.0 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper) (rev 01) 05:00.1 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper) (rev 01) 06:01.0 Ethernet controller: Intel Corporation 82541PI Gigabit Ethernet

Hello all ! I get the same effect when mounting nfs-exported directories from dom0 in domU. Every mount/umount/showmount command in domU produces the message in the dom0 syslog. I run 2.0.6 compiled from source, with 2.6 dom0 and 2.4 domU on a P4 HT 3.2Ghz. Perhaps this helps to track the problem down. Greetings, Martin ---------- The messages : (dom0 hostname is zen, domU hostname is ftp,

...many interrupts and one of the cpus is overloaded. Example: i have 4 cpus and i have configured irqbalance= off, so there is no irqbalancing done by xen. Now if i have affintized all my physical interrutps to one cpu say cpu1 all the interrutps shpuld be handled by the cpu1 and so should all the softirqs generated. Now what happens if one of the other cpus is lightly loaded, will some of the softirqs be queued against the other cpus or will cpu1 handle all interrupts and softirqs. Looks to me like there are two levels of interrupt redirection, one done by the hardware where each physical device in...

I''m getting subj trying to run linux-iscsi-4.0.2 on domain0. I tried xen-2.0.6, xen-2-test and xen-3-devel. The same results. I found similar complaints regarding this problem like below: http://www.ussg.iu.edu/hypermail/linux/kernel/0503.1/1622.html http://www.ussg.iu.edu/hypermail/linux/kernel/0503.1/1621.html Not sure if it is xen or linux-iscsi related bug. Any ideas how to cure it

When we fill up a receive VQ, try_fill_recv currently tries to count kicks using a 64 bit stats counter. Turns out, on a 32 bit kernel that uses a seqcount. sequence counts are "lock" constructs where you need to make sure that writers are serialized. In turn, this means that we mustn't run two try_fill_recv concurrently. Which of course we don't. We do run try_fill_recv

Add self pause ability, which is required by vcpu0/dom0 when running on a AP. This can''t be satisfied by existing interface, since the new flag also serves as a sync point. Signed-off-by Kevin Tian <kevin.tian@intel.com> diff -r d5315422dbc8 xen/common/domain.c --- a/xen/common/domain.c Mon May 14 18:35:31 2007 -0400 +++ b/xen/common/domain.c Mon May 14 20:21:04 2007 -0400 @@

When we fill up a receive VQ, try_fill_recv currently tries to count kicks using a 64 bit stats counter. Turns out, on a 32 bit kernel that uses a seqcount. sequence counts are "lock" constructs where you need to make sure that writers are serialized. In turn, this means that we mustn't run two try_fill_recv concurrently. Which of course we don't. We do run try_fill_recv

__napi_schedule might raise softirq but nothing causes do_softirq to trigger, so it does not in fact run. As a result, the error message "NOHZ: local_softirq_pending 08" sometimes occurs during boot of a KVM guest when the network service is started and we are oom: ... Bringing up loopback interface: [ OK ] Bringing up interface eth0: Determining IP information for

__napi_schedule might raise softirq but nothing causes do_softirq to trigger, so it does not in fact run. As a result, the error message "NOHZ: local_softirq_pending 08" sometimes occurs during boot of a KVM guest when the network service is started and we are oom: ... Bringing up loopback interface: [ OK ] Bringing up interface eth0: Determining IP information for

...:05:22 2007 -0400 +++ b/xen/include/xen/softirq.h Tue Jun 26 18:05:22 2007 -0400 @@ -10,8 +10,9 @@ #define PAGE_SCRUB_SOFTIRQ 5 #define TRACE_SOFTIRQ 6 #define RCU_SOFTIRQ 7 +#define PM_SOFTIRQ 8 -#define NR_COMMON_SOFTIRQS 8 +#define NR_COMMON_SOFTIRQS 9 #include <asm/softirq.h> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel

Hello ext3-users, we have an oopsy situation here: we have 4 machines: 3 client nodes, 1 master: the master holds a fairly big repository of small files. The repo's current size is ~40GB with ~1.2 M files in ~100 directories. Now, we like to rsync changes from the master to the client nodes, which is working perfectly for 2 nodes, but our 3rd node oopses "sometimes", rendering

Hello everyone, Reposting with after having applied the (minor) fixes suggested by Wei and Jan. Allen, if you can tell us what you think about this, or suggest someone else to ask some feedback to, if you''re no longer involved with VT-d, that would be great! :-) -- As already discussed here [1], dealing with IOMMU faults in interrupt context may cause nasty things to happen, up to

I have small xen VM running centos4 which acts as a router/firewall, and has been working fine for over 1.5 years with 32MB of RAM and a kernel I either got from xensource.org or built myself from their sources. (centos 4 didn't have a xen kernel back then) I lost the kernel to a corrupted disk and decided to use the centos provided xen kernel. All these months 32MB + 64MB Swap was more than

>> static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) >> { >> struct virtio_net_hdr_mrg_rxbuf *hdr; >> @@ -1130,9 +1172,11 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, >> struct net_device *dev) >> int err; >> struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); >> bool kick =

>> static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) >> { >> struct virtio_net_hdr_mrg_rxbuf *hdr; >> @@ -1130,9 +1172,11 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, >> struct net_device *dev) >> int err; >> struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); >> bool kick =

..._64_after_hwframe+0x44/0xa9 [ 30.457329] irq event stamp: 366850 [ 30.457335] hardirqs last enabled at (366850): [<ffffffffa11312ff>] rcu_nocb_unlock_irqrestore+0x4f/0x60 [ 30.457342] hardirqs last disabled at (366849): [<ffffffffa11384ef>] rcu_do_batch+0x59f/0x990 [ 30.457347] softirqs last enabled at (366834): [<ffffffffa1c002d7>] __do_softirq+0x2d7/0x4a4 [ 30.457357] softirqs last disabled at (366839): [<ffffffffa10928c2>] run_ksoftirqd+0x32/0x60 [ 30.457363] other info that might help us debug this: [ 30.457369] Possible unsafe locking scenar...

> I get the same effect when mounting nfs-exported directories > from dom0 in domU. > Every mount/umount/showmount command in domU produces the > message in the dom0 syslog. > > I run 2.0.6 compiled from source, with 2.6 dom0 and 2.4 domU > on a P4 HT 3.2Ghz. This is a native Linux bug. A patch has been submitted upstream, but is already in our 2.0-testing and unstable

Hi, I''m seeing this in the current linux-next tree: ------------[ cut here ]------------ WARNING: at kernel/softirq.c:143 local_bh_enable+0x40/0x87() Modules linked in: xt_state dm_mirror dm_region_hash dm_log microcode [last unloaded: scsi_wait_scan] Pid: 0, comm: swapper Not tainted 2.6.35-rc6-next-20100729+ #29 Call Trace: <IRQ> [<ffffffff81030de3>]